diff --git a/index.html b/index.html
index 7df2b02..2a64fed 100644
--- a/index.html
+++ b/index.html
@@ -769,22 +769,23 @@ <h2>Images</h2>
 				</header>
 				
 					<h3>Plain <code>&lt;img&gt;</code> element</h3>
-					<p><img src="https://placekitten.com/480/480" alt="Photo of a kitten"></p>
+					<p><img src="https://placehold.co/480x480/EEE/31343C" alt="Placeholder image"></p>
 					<h3><code>&lt;figure&gt;</code> element with <code>&lt;img&gt;</code> element</h3>
-					<figure><img src="https://placekitten.com/420/420" alt="Photo of a kitten"></figure>
+					<figure><img src="https://placehold.co/420x420/EEE/31343C" alt="Placeholder image"></figure>
 					<h3><code>&lt;figure&gt;</code> element with <code>&lt;img&gt;</code> and
 						<code>&lt;figcaption&gt;</code> elements
 					</h3>
 					<figure>
-						<img src="https://placekitten.com/420/420" alt="Photo of a kitten">
+						<img src="https://placehold.co/420x420/EEE/31343C" alt="Placeholder image">
 						<figcaption>Here is a caption for this image.</figcaption>
 					</figure>
 					<h3><code>&lt;figure&gt;</code> element with a <code>&lt;picture&gt;</code> element</h3>
 					<figure>
 						<picture>
-							<source srcset="https://placekitten.com/800/800" media="(min-width: 800px)">
-							<img src="https://placekitten.com/420/420" alt="Photo of a kitten" />
+							<source srcset="https://placehold.co/2000x2000/EEE/31343C" media="(min-width: 800px)">
+							<img src="https://placehold.co/420x420/EEE/31343C" alt="Placeholder image" />
 						</picture>
+						<figcaption>Here is a caption for this image.</figcaption>
 					</figure>
 				
 				<footer>
@@ -795,7 +796,7 @@ <h3><code>&lt;figure&gt;</code> element with a <code>&lt;picture&gt;</code> elem
 				<header>
 					<h2>Background images</h2>
 				</header>
-				<figure style="background-image:url('https://placekitten.com/300/300'); width:300px; height: 300px;">
+				<figure style="background-image:url('https://placehold.co/300x300/EEE/31343C'); width:300px; height: 300px;">
 				</figure>
 				<footer>
 					<p><a href="#top">[Top]</a></p>
diff --git a/simple-v1.min.css b/simple-v1.min.css
index 36b37ae..2668b58 100644
--- a/simple-v1.min.css
+++ b/simple-v1.min.css
@@ -1 +1 @@
-:root{--sans-font:-apple-system,BlinkMacSystemFont,"Avenir Next",Avenir,"Nimbus Sans L",Roboto,Noto,"Segoe UI",Arial,Helvetica,"Helvetica Neue",sans-serif;--mono-font:Consolas,Menlo,Monaco,"Andale Mono","Ubuntu Mono",monospace;--base-fontsize:1.15rem;--header-scale:1.25;--line-height:1.618;--bg:#fff;--accent-bg:#f5f7ff;--text:#212121;--text-light:#585858;--border:#d8dae1;--accent:#0d47a1;--accent-light:#90caf9;--code:#d81b60;--preformatted:#444;--marked:#ffdd33;--disabled:#efefef}@media (prefers-color-scheme:dark){:root{--bg:#212121;--accent-bg:#2b2b2b;--text:#dcdcdc;--text-light:#ababab;--border:#666;--accent:#ffb300;--accent-light:#ffecb3;--code:#f06292;--preformatted:#ccc;--disabled:#111}img,video{opacity:.6}}html{font-family:var(--sans-font)}body{color:var(--text);background:var(--bg);font-size:var(--base-fontsize);line-height:var(--line-height);display:flex;min-height:100vh;flex-direction:column;flex:1;margin:0 auto;max-width:45rem;padding:0 .5rem;overflow-x:hidden;word-break:break-word;overflow-wrap:break-word}header{background:var(--accent-bg);border-bottom:1px solid var(--border);text-align:center;padding:2rem .5rem;width:100vw;position:relative;box-sizing:border-box;left:50%;right:50%;margin-left:-50vw;margin-right:-50vw}header h1,header p{margin:0}main{padding-top:1.5rem}h1,h2,h3{line-height:1.1}nav{font-size:1rem;line-height:2;padding:1rem 0}nav a{margin:1rem 1rem 0 0;border:1px solid var(--border);border-radius:5px;color:var(--text)!important;display:inline-block;padding:.1rem 1rem;text-decoration:none;transition:.4s}nav a:hover{color:var(--accent)!important;border-color:var(--accent)}nav a.current:hover{text-decoration:none}footer{margin-top:4rem;padding:2rem 1rem 1.5rem 1rem;color:var(--text-light);font-size:.9rem;text-align:center;border-top:1px solid var(--border)}h1{font-size:calc(var(--base-fontsize) * var(--header-scale) * var(--header-scale) * var(--header-scale) * var(--header-scale));margin-top:calc(var(--line-height) * 1.5rem)}h2{font-size:calc(var(--base-fontsize) * var(--header-scale) * var(--header-scale) * var(--header-scale));margin-top:calc(var(--line-height) * 1.5rem)}h3{font-size:calc(var(--base-fontsize) * var(--header-scale) * var(--header-scale));margin-top:calc(var(--line-height) * 1.5rem)}h4{font-size:calc(var(--base-fontsize) * var(--header-scale));margin-top:calc(var(--line-height) * 1.5rem)}h5{font-size:var(--base-fontsize);margin-top:calc(var(--line-height) * 1.5rem)}h6{font-size:calc(var(--base-fontsize)/ var(--header-scale));margin-top:calc(var(--line-height) * 1.5rem)}a,a:visited{color:var(--accent)}a:hover{text-decoration:none}[role=button],a button,button,input[type=button],input[type=reset],input[type=submit]{border:none;border-radius:5px;background:var(--accent);font-size:1rem;color:var(--bg);padding:.7rem .9rem;margin:.5rem 0;transition:.4s}[role=button][aria-disabled=true],a button[disabled],button[disabled],input[type=button][disabled],input[type=checkbox][disabled],input[type=radio][disabled],input[type=reset][disabled],input[type=submit][disabled],select[disabled]{cursor:default;opacity:.5;cursor:not-allowed}input:disabled,select:disabled,textarea:disabled{cursor:not-allowed;background-color:var(--disabled)}input[type=range]{padding:0}abbr{cursor:help}[role=button]:focus,[role=button]:not([aria-disabled=true]):hover,button:enabled:hover,button:focus,input[type=button]:enabled:hover,input[type=button]:focus,input[type=checkbox]:enabled:hover,input[type=checkbox]:focus,input[type=radio]:enabled:hover,input[type=radio]:focus,input[type=reset]:enabled:hover,input[type=reset]:focus,input[type=submit]:enabled:hover,input[type=submit]:focus{filter:brightness(1.4);cursor:pointer}details{background:var(--accent-bg);border:1px solid var(--border);border-radius:5px;margin-bottom:1rem}summary{cursor:pointer;font-weight:700;padding:.6rem 1rem}details[open]{padding:.6rem 1rem .75rem 1rem}details[open] summary{margin-bottom:.5rem;padding:0}details[open]>:last-child{margin-bottom:0}table{border-collapse:collapse;width:100%;margin:1.5rem 0}td,th{border:1px solid var(--border);text-align:left;padding:.5rem}th{background:var(--accent-bg);font-weight:700}tr:nth-child(even){background:var(--accent-bg)}table caption{font-weight:700;margin-bottom:.5rem}ol,ul{padding-left:3rem}input,select,textarea{font-size:inherit;font-family:inherit;padding:.5rem;margin-bottom:.5rem;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:5px;box-shadow:none;box-sizing:border-box;width:60%;-moz-appearance:none;-webkit-appearance:none;appearance:none}select{background-image:linear-gradient(45deg,transparent 49%,var(--text) 51%),linear-gradient(135deg,var(--text) 51%,transparent 49%);background-position:calc(100% - 20px),calc(100% - 15px);background-size:5px 5px,5px 5px;background-repeat:no-repeat}select[multiple]{background-image:none!important}input[type=checkbox],input[type=radio]{vertical-align:bottom;position:relative}input[type=radio]{border-radius:100%}input[type=checkbox]:checked,input[type=radio]:checked{background:var(--accent)}input[type=checkbox]:checked::after{content:" ";width:.1em;height:.25em;border-radius:0;position:absolute;top:.05em;left:.18em;background:0 0;border-right:solid var(--bg) .08em;border-bottom:solid var(--bg) .08em;font-size:1.8em;transform:rotate(45deg)}input[type=radio]:checked::after{content:" ";width:.25em;height:.25em;border-radius:100%;position:absolute;top:.125em;background:var(--bg);left:.125em;font-size:32px}textarea{width:80%}@media only screen and (max-width:720px){input,select,textarea{width:100%}}input[type=checkbox],input[type=radio]{width:auto}input[type=file]{border:0}fieldset{border:0;padding:0;margin:0}hr{color:var(--border);border-top:1px;margin:1rem auto}mark{padding:2px 5px;border-radius:4px;background:var(--marked)}main img,main video{max-width:100%;height:auto;border-radius:5px}figure{margin:0}figcaption{font-size:.9rem;color:var(--text-light);text-align:center;margin-bottom:1rem}blockquote{margin:2rem 0 2rem 2rem;padding:.4rem .8rem;border-left:.35rem solid var(--accent);opacity:.8;font-style:italic}cite{font-size:.9rem;color:var(--text-light);font-style:normal}code,kbd,pre,pre span,samp{font-size:1.075rem;font-family:var(--mono-font);color:var(--code)}kbd{color:var(--preformatted);border:1px solid var(--preformatted);border-bottom:3px solid var(--preformatted);border-radius:5px;padding:.1rem}pre{padding:1rem 1.4rem;max-width:100%;overflow:auto;overflow-x:auto;color:var(--preformatted);background:var(--accent-bg);border:1px solid var(--border);border-radius:5px}pre code{color:var(--preformatted);background:0 0;margin:0;padding:0}
\ No newline at end of file
+:root{--sans-font:-apple-system,BlinkMacSystemFont,"Avenir Next",Avenir,"Nimbus Sans L",Roboto,Noto,"Segoe UI",Arial,Helvetica,"Helvetica Neue",sans-serif;--mono-font:Consolas,Menlo,Monaco,"Andale Mono","Ubuntu Mono",monospace;--base-fontsize:1.15rem;--header-scale:1.25;--line-height:1.618;--bg:#fff;--accent-bg:#f5f7ff;--text:#212121;--text-light:#585858;--border:#d8dae1;--accent:#0d47a1;--accent-light:#90caf9;--code:#d81b60;--preformatted:#444;--marked:#fd3;--disabled:#efefef}@media (prefers-color-scheme:dark){:root{--bg:#212121;--accent-bg:#2b2b2b;--text:#dcdcdc;--text-light:#ababab;--border:#666;--accent:#ffb300;--accent-light:#ffecb3;--code:#f06292;--preformatted:#ccc;--disabled:#111}img,video{opacity:.6}}html{font-family:var(--sans-font)}body{color:var(--text);background:var(--bg);font-size:var(--base-fontsize);line-height:var(--line-height);word-break:break-word;overflow-wrap:break-word;flex-direction:column;flex:1;max-width:45rem;min-height:100vh;margin:0 auto;padding:0 .5rem;display:flex;overflow-x:hidden}header{background:var(--accent-bg);border-bottom:1px solid var(--border);text-align:center;box-sizing:border-box;width:100vw;margin-left:-50vw;margin-right:-50vw;padding:2rem .5rem;position:relative;left:50%;right:50%}header h1,header p{margin:0}main{padding-top:1.5rem}h1,h2,h3{line-height:1.1}nav{padding:1rem 0;font-size:1rem;line-height:2}nav a{border:1px solid var(--border);border-radius:5px;margin:1rem 1rem 0 0;padding:.1rem 1rem;text-decoration:none;transition:all .4s;display:inline-block;color:var(--text)!important}nav a:hover{border-color:var(--accent);color:var(--accent)!important}nav a.current:hover{text-decoration:none}footer{color:var(--text-light);text-align:center;border-top:1px solid var(--border);margin-top:4rem;padding:2rem 1rem 1.5rem;font-size:.9rem}h1{font-size:calc(var(--base-fontsize)*var(--header-scale)*var(--header-scale)*var(--header-scale)*var(--header-scale));margin-top:calc(var(--line-height)*1.5rem)}h2{font-size:calc(var(--base-fontsize)*var(--header-scale)*var(--header-scale)*var(--header-scale));margin-top:calc(var(--line-height)*1.5rem)}h3{font-size:calc(var(--base-fontsize)*var(--header-scale)*var(--header-scale));margin-top:calc(var(--line-height)*1.5rem)}h4{font-size:calc(var(--base-fontsize)*var(--header-scale));margin-top:calc(var(--line-height)*1.5rem)}h5{font-size:var(--base-fontsize);margin-top:calc(var(--line-height)*1.5rem)}h6{font-size:calc(var(--base-fontsize)/var(--header-scale));margin-top:calc(var(--line-height)*1.5rem)}a,a:visited{color:var(--accent)}a:hover{text-decoration:none}a button,button,[role=button],input[type=submit],input[type=reset],input[type=button]{background:var(--accent);color:var(--bg);border:none;border-radius:5px;margin:.5rem 0;padding:.7rem .9rem;font-size:1rem;transition:all .4s}a button[disabled],button[disabled],[role=button][aria-disabled=true],input[type=submit][disabled],input[type=reset][disabled],input[type=button][disabled],input[type=checkbox][disabled],input[type=radio][disabled],select[disabled]{cursor:default;opacity:.5;cursor:not-allowed}input:disabled,textarea:disabled,select:disabled{cursor:not-allowed;background-color:var(--disabled)}input[type=range]{padding:0}abbr{cursor:help}button:focus,button:enabled:hover,[role=button]:focus,[role=button]:not([aria-disabled=true]):hover,input[type=submit]:focus,input[type=submit]:enabled:hover,input[type=reset]:focus,input[type=reset]:enabled:hover,input[type=button]:focus,input[type=button]:enabled:hover,input[type=checkbox]:focus,input[type=checkbox]:enabled:hover,input[type=radio]:focus,input[type=radio]:enabled:hover{filter:brightness(1.4);cursor:pointer}details{background:var(--accent-bg);border:1px solid var(--border);border-radius:5px;margin-bottom:1rem}summary{cursor:pointer;padding:.6rem 1rem;font-weight:700}details[open]{padding:.6rem 1rem .75rem}details[open] summary{margin-bottom:.5rem;padding:0}details[open]>:last-child{margin-bottom:0}table{border-collapse:collapse;width:100%;margin:1.5rem 0}td,th{border:1px solid var(--border);text-align:left;padding:.5rem}th{background:var(--accent-bg);font-weight:700}tr:nth-child(2n){background:var(--accent-bg)}table caption{margin-bottom:.5rem;font-weight:700}ol,ul{padding-left:3rem}textarea,select,input{font-size:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);box-shadow:none;box-sizing:border-box;-webkit-appearance:none;-moz-appearance:none;appearance:none;border-radius:5px;width:60%;margin-bottom:.5rem;padding:.5rem;font-family:inherit}select{background-image:linear-gradient(45deg,transparent 49%,var(--text)51%),linear-gradient(135deg,var(--text)51%,transparent 49%);background-position:calc(100% - 20px),calc(100% - 15px);background-repeat:no-repeat;background-size:5px 5px,5px 5px}select[multiple]{background-image:none!important}input[type=checkbox],input[type=radio]{vertical-align:bottom;position:relative}input[type=radio]{border-radius:100%}input[type=checkbox]:checked,input[type=radio]:checked{background:var(--accent)}input[type=checkbox]:checked:after{content:" ";border-right:solid var(--bg).08em;border-bottom:solid var(--bg).08em;background:0 0;border-radius:0;width:.1em;height:.25em;font-size:1.8em;position:absolute;top:.05em;left:.18em;transform:rotate(45deg)}input[type=radio]:checked:after{content:" ";background:var(--bg);border-radius:100%;width:.25em;height:.25em;font-size:32px;position:absolute;top:.125em;left:.125em}textarea{width:80%}@media only screen and (width<=720px){textarea,select,input{width:100%}}input[type=checkbox],input[type=radio]{width:auto}input[type=file]{border:0}fieldset{border:0;margin:0;padding:0}hr{color:var(--border);border-top:1px;margin:1rem auto}mark{background:var(--marked);border-radius:4px;padding:2px 5px}main img,main video{border-radius:5px;max-width:100%;height:auto}figure{margin:0}figcaption{color:var(--text-light);text-align:center;margin-bottom:1rem;font-size:.9rem}blockquote{border-left:.35rem solid var(--accent);opacity:.8;margin:2rem 0 2rem 2rem;padding:.4rem .8rem;font-style:italic}cite{color:var(--text-light);font-size:.9rem;font-style:normal}code,pre,pre span,kbd,samp{font-size:1.075rem;font-family:var(--mono-font);color:var(--code)}kbd{color:var(--preformatted);border:1px solid var(--preformatted);border-bottom:3px solid var(--preformatted);border-radius:5px;padding:.1rem}pre{color:var(--preformatted);background:var(--accent-bg);border:1px solid var(--border);border-radius:5px;max-width:100%;padding:1rem 1.4rem;overflow:auto}pre code{color:var(--preformatted);background:0 0;margin:0;padding:0}
\ No newline at end of file
diff --git a/simple.css b/simple.css
index 788d069..984203c 100644
--- a/simple.css
+++ b/simple.css
@@ -564,11 +564,17 @@ figure {
   overflow-x: auto;
 }
 
+figure > img,
+figure > picture > img {
+  display: block;
+  margin-inline: auto;
+}
+
 figcaption {
   text-align: center;
   font-size: 0.9rem;
   color: var(--text-light);
-  margin-bottom: 1rem;
+  margin-block: 1rem;
 }
 
 blockquote {
diff --git a/simple.min.css b/simple.min.css
index 52dbfd4..32621c6 100644
--- a/simple.min.css
+++ b/simple.min.css
@@ -1 +1 @@
-::backdrop,:root{--sans-font:-apple-system,BlinkMacSystemFont,"Avenir Next",Avenir,"Nimbus Sans L",Roboto,"Noto Sans","Segoe UI",Arial,Helvetica,"Helvetica Neue",sans-serif;--mono-font:Consolas,Menlo,Monaco,"Andale Mono","Ubuntu Mono",monospace;--standard-border-radius:5px;--bg:#fff;--accent-bg:#f5f7ff;--text:#212121;--text-light:#585858;--border:#898EA4;--accent:#0d47a1;--accent-hover:#1266e2;--accent-text:var(--bg);--code:#d81b60;--preformatted:#444;--marked:#ffdd33;--disabled:#efefef}@media (prefers-color-scheme:dark){::backdrop,:root{color-scheme:dark;--bg:#212121;--accent-bg:#2b2b2b;--text:#dcdcdc;--text-light:#ababab;--accent:#ffb300;--accent-hover:#ffe099;--accent-text:var(--bg);--code:#f06292;--preformatted:#ccc;--disabled:#111}img,video{opacity:.8}}*,::after,::before{box-sizing:border-box}input,progress,select,textarea{appearance:none;-webkit-appearance:none;-moz-appearance:none}html{font-family:var(--sans-font);scroll-behavior:smooth}body{color:var(--text);background-color:var(--bg);font-size:1.15rem;line-height:1.5;display:grid;grid-template-columns:1fr min(45rem,90%) 1fr;margin:0}body>*{grid-column:2}body>header{background-color:var(--accent-bg);border-bottom:1px solid var(--border);text-align:center;padding:0 .5rem 2rem .5rem;grid-column:1/-1}body>header>:only-child{margin-block-start:2rem}body>header h1{max-width:1200px;margin:1rem auto}body>header p{max-width:40rem;margin:1rem auto}main{padding-top:1.5rem}body>footer{margin-top:4rem;padding:2rem 1rem 1.5rem 1rem;color:var(--text-light);font-size:.9rem;text-align:center;border-top:1px solid var(--border)}h1{font-size:3rem}h2{font-size:2.6rem;margin-top:3rem}h3{font-size:2rem;margin-top:3rem}h4{font-size:1.44rem}h5{font-size:1.15rem}h6{font-size:.96rem}p{margin:1.5rem 0}h1,h2,h3,h4,h5,h6,p{overflow-wrap:break-word}h1,h2,h3{line-height:1.1}@media only screen and (max-width:720px){h1{font-size:2.5rem}h2{font-size:2.1rem}h3{font-size:1.75rem}h4{font-size:1.25rem}}a,a:visited{color:var(--accent)}a:hover{text-decoration:none}.button,a.button,button,input[type=button],input[type=reset],input[type=submit],label[type=button]{border:1px solid var(--accent);background-color:var(--accent);color:var(--accent-text);padding:.5rem .9rem;text-decoration:none;line-height:normal}.button[aria-disabled=true],button[disabled],input:disabled,select:disabled,textarea:disabled{cursor:not-allowed;background-color:var(--disabled);border-color:var(--disabled);color:var(--text-light)}input[type=range]{padding:0}abbr[title]{cursor:help;text-decoration-line:underline;text-decoration-style:dotted}.button:not([aria-disabled=true]):hover,button:enabled:hover,input[type=button]:enabled:hover,input[type=reset]:enabled:hover,input[type=submit]:enabled:hover,label[type=button]:hover{background-color:var(--accent-hover);border-color:var(--accent-hover);cursor:pointer}.button:focus-visible,button:focus-visible:where(:enabled),input:enabled:focus-visible:where([type=submit],[type=reset],[type=button]){outline:2px solid var(--accent);outline-offset:1px}header>nav{font-size:1rem;line-height:2;padding:1rem 0 0 0}header>nav ol,header>nav ul{align-content:space-around;align-items:center;display:flex;flex-direction:row;flex-wrap:wrap;justify-content:center;list-style-type:none;margin:0;padding:0}header>nav ol li,header>nav ul li{display:inline-block}header>nav a,header>nav a:visited{margin:0 .5rem 1rem .5rem;border:1px solid var(--border);border-radius:var(--standard-border-radius);color:var(--text);display:inline-block;padding:.1rem 1rem;text-decoration:none}header>nav a.current,header>nav a:hover,header>nav a[aria-current=page]{border-color:var(--accent);color:var(--accent);cursor:pointer}@media only screen and (max-width:720px){header>nav a{border:none;padding:0;text-decoration:underline;line-height:1}}aside,details,pre,progress{background-color:var(--accent-bg);border:1px solid var(--border);border-radius:var(--standard-border-radius);margin-bottom:1rem}aside{font-size:1rem;width:30%;padding:0 15px;margin-inline-start:15px;float:right}[dir=rtl] aside{float:left}@media only screen and (max-width:720px){aside{width:100%;float:none;margin-inline-start:0}}article,dialog,fieldset{border:1px solid var(--border);padding:1rem;border-radius:var(--standard-border-radius);margin-bottom:1rem}article h2:first-child,section h2:first-child{margin-top:1rem}section{border-top:1px solid var(--border);border-bottom:1px solid var(--border);padding:2rem 1rem;margin:3rem 0}section+section,section:first-child{border-top:0;padding-top:0}section:last-child{border-bottom:0;padding-bottom:0}details{padding:.7rem 1rem}summary{cursor:pointer;font-weight:700;padding:.7rem 1rem;margin:-.7rem -1rem;word-break:break-all}details[open]>summary+*{margin-top:0}details[open]>summary{margin-bottom:.5rem}details[open]>:last-child{margin-bottom:0}table{border-collapse:collapse;margin:1.5rem 0}figure>table{width:max-content}td,th{border:1px solid var(--border);text-align:start;padding:.5rem}th{background-color:var(--accent-bg);font-weight:700}tr:nth-child(even){background-color:var(--accent-bg)}table caption{font-weight:700;margin-bottom:.5rem}.button,button,input,select,textarea{font-size:inherit;font-family:inherit;padding:.5rem;margin-bottom:.5rem;border-radius:var(--standard-border-radius);box-shadow:none;max-width:100%;display:inline-block}input,select,textarea{color:var(--text);background-color:var(--bg);border:1px solid var(--border)}label{display:block}textarea:not([cols]){width:100%}select:not([multiple]){background-image:linear-gradient(45deg,transparent 49%,var(--text) 51%),linear-gradient(135deg,var(--text) 51%,transparent 49%);background-position:calc(100% - 15px),calc(100% - 10px);background-size:5px 5px,5px 5px;background-repeat:no-repeat;padding-inline-end:25px}[dir=rtl] select:not([multiple]){background-position:10px,15px}input[type=checkbox],input[type=radio]{vertical-align:middle;position:relative;width:min-content}input[type=checkbox]+label,input[type=radio]+label{display:inline-block}input[type=radio]{border-radius:100%}input[type=checkbox]:checked,input[type=radio]:checked{background-color:var(--accent)}input[type=checkbox]:checked::after{content:" ";width:.18em;height:.32em;border-radius:0;position:absolute;top:.05em;left:.17em;background-color:transparent;border-right:solid var(--bg) .08em;border-bottom:solid var(--bg) .08em;font-size:1.8em;transform:rotate(45deg)}input[type=radio]:checked::after{content:" ";width:.25em;height:.25em;border-radius:100%;position:absolute;top:.125em;background-color:var(--bg);left:.125em;font-size:32px}@media only screen and (max-width:720px){input,select,textarea{width:100%}}input[type=color]{height:2.5rem;padding:.2rem}input[type=file]{border:0}hr{border:none;height:1px;background:var(--border);margin:1rem 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0;margin:0;padding:0}progress{width:100%}progress:indeterminate{background-color:var(--accent-bg)}progress::-webkit-progress-bar{border-radius:var(--standard-border-radius);background-color:var(--accent-bg)}progress::-webkit-progress-value{border-radius:var(--standard-border-radius);background-color:var(--accent)}progress::-moz-progress-bar{border-radius:var(--standard-border-radius);background-color:var(--accent);transition-property:width;transition-duration:.3s}progress:indeterminate::-moz-progress-bar{background-color:var(--accent-bg)}dialog{max-width:40rem;margin:auto}dialog::backdrop{background-color:var(--bg);opacity:.8}@media only screen and (max-width:720px){dialog{max-width:100%;margin:auto 1em}}sub,sup{vertical-align:baseline;position:relative}sup{top:-.4em}sub{top:.3em}.notice{background:var(--accent-bg);border:2px solid var(--border);border-radius:var(--standard-border-radius);padding:1.5rem;margin:2rem 0}
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+:root,::backdrop{--sans-font:-apple-system,BlinkMacSystemFont,"Avenir Next",Avenir,"Nimbus Sans L",Roboto,"Noto Sans","Segoe UI",Arial,Helvetica,"Helvetica Neue",sans-serif;--mono-font:Consolas,Menlo,Monaco,"Andale Mono","Ubuntu Mono",monospace;--standard-border-radius:5px;--bg:#fff;--accent-bg:#f5f7ff;--text:#212121;--text-light:#585858;--border:#898ea4;--accent:#0d47a1;--accent-hover:#1266e2;--accent-text:var(--bg);--code:#d81b60;--preformatted:#444;--marked:#fd3;--disabled:#efefef}@media 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auto}main{padding-top:1.5rem}body>footer{color:var(--text-light);text-align:center;border-top:1px solid var(--border);margin-top:4rem;padding:2rem 1rem 1.5rem;font-size:.9rem}h1{font-size:3rem}h2{margin-top:3rem;font-size:2.6rem}h3{margin-top:3rem;font-size:2rem}h4{font-size:1.44rem}h5{font-size:1.15rem}h6{font-size:.96rem}p{margin:1.5rem 0}p,h1,h2,h3,h4,h5,h6{overflow-wrap:break-word}h1,h2,h3{line-height:1.1}@media only screen and (width<=720px){h1{font-size:2.5rem}h2{font-size:2.1rem}h3{font-size:1.75rem}h4{font-size:1.25rem}}a,a:visited{color:var(--accent)}a:hover{text-decoration:none}button,.button,a.button,input[type=submit],input[type=reset],input[type=button],label[type=button]{border:1px solid var(--accent);background-color:var(--accent);color:var(--accent-text);padding:.5rem 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center;align-items:center;margin:0;padding:0;list-style-type:none;display:flex}header>nav ul li,header>nav ol li{display:inline-block}header>nav a,header>nav a:visited{border:1px solid var(--border);border-radius:var(--standard-border-radius);color:var(--text);margin:0 .5rem 1rem;padding:.1rem 1rem;text-decoration:none;display:inline-block}header>nav a:hover,header>nav a.current,header>nav a[aria-current=page]{border-color:var(--accent);color:var(--accent);cursor:pointer}@media only screen and (width<=720px){header>nav a{border:none;padding:0;line-height:1;text-decoration:underline}}aside,details,pre,progress{background-color:var(--accent-bg);border:1px solid var(--border);border-radius:var(--standard-border-radius);margin-bottom:1rem}aside{float:right;width:30%;margin-inline-start:15px;padding:0 15px;font-size:1rem}[dir=rtl] aside{float:left}@media only screen and (width<=720px){aside{float:none;width:100%;margin-inline-start:0}}article,fieldset,dialog{border:1px solid var(--border);border-radius:var(--standard-border-radius);margin-bottom:1rem;padding:1rem}article h2:first-child,section h2:first-child{margin-top:1rem}section{border-top:1px solid var(--border);border-bottom:1px solid var(--border);margin:3rem 0;padding:2rem 1rem}section+section,section:first-child{border-top:0;padding-top:0}section:last-child{border-bottom:0;padding-bottom:0}details{padding:.7rem 1rem}summary{cursor:pointer;word-break:break-all;margin:-.7rem -1rem;padding:.7rem 1rem;font-weight:700}details[open]>summary+*{margin-top:0}details[open]>summary{margin-bottom:.5rem}details[open]>:last-child{margin-bottom:0}table{border-collapse:collapse;margin:1.5rem 0}figure>table{width:max-content}td,th{border:1px solid var(--border);text-align:start;padding:.5rem}th{background-color:var(--accent-bg);font-weight:700}tr:nth-child(2n){background-color:var(--accent-bg)}table caption{margin-bottom:.5rem;font-weight:700}textarea,select,input,button,.button{font-size:inherit;border-radius:var(--standard-border-radius);box-shadow:none;max-width:100%;margin-bottom:.5rem;padding:.5rem;font-family:inherit;display:inline-block}textarea,select,input{color:var(--text);background-color:var(--bg);border:1px solid var(--border)}label{display:block}textarea:not([cols]){width:100%}select:not([multiple]){background-image:linear-gradient(45deg,transparent 49%,var(--text)51%),linear-gradient(135deg,var(--text)51%,transparent 49%);background-position:calc(100% - 15px),calc(100% - 10px);background-repeat:no-repeat;background-size:5px 5px,5px 5px;padding-inline-end:25px}[dir=rtl] select:not([multiple]){background-position:10px,15px}input[type=checkbox],input[type=radio]{vertical-align:middle;width:min-content;position:relative}input[type=checkbox]+label,input[type=radio]+label{display:inline-block}input[type=radio]{border-radius:100%}input[type=checkbox]:checked,input[type=radio]:checked{background-color:var(--accent)}input[type=checkbox]:checked:after{content:" ";border-right:solid var(--bg).08em;border-bottom:solid var(--bg).08em;background-color:#0000;border-radius:0;width:.18em;height:.32em;font-size:1.8em;position:absolute;top:.05em;left:.17em;transform:rotate(45deg)}input[type=radio]:checked:after{content:" ";background-color:var(--bg);border-radius:100%;width:.25em;height:.25em;font-size:32px;position:absolute;top:.125em;left:.125em}@media only screen and (width<=720px){textarea,select,input{width:100%}}input[type=color]{height:2.5rem;padding:.2rem}input[type=file]{border:0}hr{background:var(--border);border:none;height:1px;margin:1rem auto}mark{border-radius:var(--standard-border-radius);background-color:var(--marked);color:#000;padding:2px 5px}mark a{color:#0d47a1}img,video{border-radius:var(--standard-border-radius);max-width:100%;height:auto}figure{margin:0;display:block;overflow-x:auto}figure>img,figure>picture>img{margin-inline:auto;display:block}figcaption{text-align:center;color:var(--text-light);margin-block:1rem;font-size:.9rem}blockquote{border-inline-start:.35rem solid var(--accent);color:var(--text-light);margin-block:2rem;margin-inline:2rem 0;padding:.4rem .8rem;font-style:italic}cite{color:var(--text-light);font-size:.9rem;font-style:normal}dt{color:var(--text-light)}code,pre,pre span,kbd,samp{font-family:var(--mono-font);color:var(--code)}kbd{color:var(--preformatted);border:1px solid var(--preformatted);border-bottom:3px solid var(--preformatted);border-radius:var(--standard-border-radius);padding:.1rem .4rem}pre{color:var(--preformatted);max-width:100%;padding:1rem 1.4rem;overflow:auto}pre code{color:var(--preformatted);background:0 0;margin:0;padding:0}progress{width:100%}progress:indeterminate{background-color:var(--accent-bg)}progress::-webkit-progress-bar{border-radius:var(--standard-border-radius);background-color:var(--accent-bg)}progress::-webkit-progress-value{border-radius:var(--standard-border-radius);background-color:var(--accent)}progress::-moz-progress-bar{border-radius:var(--standard-border-radius);background-color:var(--accent);transition-property:width;transition-duration:.3s}progress:indeterminate::-moz-progress-bar{background-color:var(--accent-bg)}dialog{max-width:40rem;margin:auto}dialog::backdrop{background-color:var(--bg);opacity:.8}@media only screen and (width<=720px){dialog{max-width:100%;margin:auto 1em}}sup,sub{vertical-align:baseline;position:relative}sup{top:-.4em}sub{top:.3em}.notice{background:var(--accent-bg);border:2px solid var(--border);border-radius:var(--standard-border-radius);margin:2rem 0;padding:1.5rem}
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