diff --git a/package-lock.json b/package-lock.json
index 6ae37b88f..879cc2904 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,8 +1,3331 @@
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+      "resolved": "https://registry.npmjs.org/unset-value/-/unset-value-1.0.0.tgz",
+      "integrity": "sha1-g3aHP30jNRef+x5vw6jtDfyKtVk=",
+      "dev": true,
+      "dependencies": {
+        "has-value": "^0.3.1",
+        "isobject": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/unset-value/node_modules/has-value": {
+      "version": "0.3.1",
+      "resolved": "https://registry.npmjs.org/has-value/-/has-value-0.3.1.tgz",
+      "integrity": "sha1-ex9YutpiyoJ+wKIHgCVlSEWZXh8=",
+      "dev": true,
+      "dependencies": {
+        "get-value": "^2.0.3",
+        "has-values": "^0.1.4",
+        "isobject": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/unset-value/node_modules/has-value/node_modules/isobject": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/isobject/-/isobject-2.1.0.tgz",
+      "integrity": "sha1-8GVWEJaj8dou9GJy+BXIQNh+DIk=",
+      "dev": true,
+      "dependencies": {
+        "isarray": "1.0.0"
+      },
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/unset-value/node_modules/has-values": {
+      "version": "0.1.4",
+      "resolved": "https://registry.npmjs.org/has-values/-/has-values-0.1.4.tgz",
+      "integrity": "sha1-bWHeldkd/Km5oCCJrThL/49it3E=",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/upath": {
+      "version": "1.2.0",
+      "resolved": "https://registry.npmjs.org/upath/-/upath-1.2.0.tgz",
+      "integrity": "sha512-aZwGpamFO61g3OlfT7OQCHqhGnW43ieH9WZeP7QxN/G/jS4jfqUkZxoryvJgVPEcrl5NL/ggHsSmLMHuH64Lhg==",
+      "dev": true,
+      "engines": {
+        "node": ">=4",
+        "yarn": "*"
+      }
+    },
+    "node_modules/urix": {
+      "version": "0.1.0",
+      "resolved": "https://registry.npmjs.org/urix/-/urix-0.1.0.tgz",
+      "integrity": "sha1-2pN/emLiH+wf0Y1Js1wpNQZ6bHI=",
+      "dev": true
+    },
+    "node_modules/use": {
+      "version": "3.1.1",
+      "resolved": "https://registry.npmjs.org/use/-/use-3.1.1.tgz",
+      "integrity": "sha512-cwESVXlO3url9YWlFW/TA9cshCEhtu7IKJ/p5soJ/gGpj7vbvFrAY/eIioQ6Dw23KjZhYgiIo8HOs1nQ2vr/oQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
+      "dev": true
+    },
+    "node_modules/utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.4.0"
+      }
+    },
+    "node_modules/uuid": {
+      "version": "3.3.2",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-3.3.2.tgz",
+      "integrity": "sha512-yXJmeNaw3DnnKAOKJE51sL/ZaYfWJRl1pK9dr19YFCu0ObS231AB1/LbqTKRAQ5kw8A90rA6fr4riOUpTZvQZA==",
+      "dev": true,
+      "bin": {
+        "uuid": "bin/uuid"
+      }
+    },
+    "node_modules/vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
+      "dev": true,
+      "engines": {
+        "node": ">= 0.8"
+      }
+    },
+    "node_modules/websocket-driver": {
+      "version": "0.7.0",
+      "resolved": "https://registry.npmjs.org/websocket-driver/-/websocket-driver-0.7.0.tgz",
+      "integrity": "sha1-DK+dLXVdk67gSdS90NP+LMoqJOs=",
+      "dev": true,
+      "dependencies": {
+        "http-parser-js": ">=0.4.0",
+        "websocket-extensions": ">=0.1.1"
+      },
+      "engines": {
+        "node": ">=0.8.0"
+      }
+    },
+    "node_modules/websocket-extensions": {
+      "version": "0.1.3",
+      "resolved": "https://registry.npmjs.org/websocket-extensions/-/websocket-extensions-0.1.3.tgz",
+      "integrity": "sha512-nqHUnMXmBzT0w570r2JpJxfiSD1IzoI+HGVdd3aZ0yNi3ngvQ4jv1dtHt5VGxfI2yj5yqImPhOK4vmIh2xMbGg==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.8.0"
+      }
+    },
+    "node_modules/which": {
+      "version": "1.3.1",
+      "resolved": "https://registry.npmjs.org/which/-/which-1.3.1.tgz",
+      "integrity": "sha512-HxJdYWq1MTIQbJ3nw0cqssHoTNU267KlrDuGZ1WYlxDStUtKUhOaJmh112/TZmHxxUfuJqPXSOm7tDyas0OSIQ==",
+      "dev": true,
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "which": "bin/which"
+      }
+    },
+    "node_modules/yallist": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
+      "dev": true
+    }
+  },
   "dependencies": {
     "accepts": {
       "version": "1.3.5",
@@ -1254,24 +4577,24 @@
           "dev": true,
           "optional": true
         },
-        "string-width": {
-          "version": "1.0.2",
+        "string_decoder": {
+          "version": "1.1.1",
           "bundled": true,
           "dev": true,
           "optional": true,
           "requires": {
-            "code-point-at": "^1.0.0",
-            "is-fullwidth-code-point": "^1.0.0",
-            "strip-ansi": "^3.0.0"
+            "safe-buffer": "~5.1.0"
           }
         },
-        "string_decoder": {
-          "version": "1.1.1",
+        "string-width": {
+          "version": "1.0.2",
           "bundled": true,
           "dev": true,
           "optional": true,
           "requires": {
-            "safe-buffer": "~5.1.0"
+            "code-point-at": "^1.0.0",
+            "is-fullwidth-code-point": "^1.0.0",
+            "strip-ansi": "^3.0.0"
           }
         },
         "strip-ansi": {
diff --git a/package.json b/package.json
index 319553f25..6f491c104 100644
--- a/package.json
+++ b/package.json
@@ -38,8 +38,8 @@
     "serve": "live-server"
   },
   "devDependencies": {
-    "live-server": "^1.2.1",
     "husky": "^0.14.3",
+    "live-server": "^1.2.1",
     "prettier": "^1.14.2",
     "pretty-quick": "^1.6.0"
   }
diff --git a/week-1/1-parent-child/index.html b/week-1/1-parent-child/index.html
index 458a4cb21..3c8abf1bc 100644
--- a/week-1/1-parent-child/index.html
+++ b/week-1/1-parent-child/index.html
@@ -27,6 +27,7 @@
           <p class="message__content">
             I can meet on Tuesday and Wednesday after 4.
           </p>
+          <span class="message__time">7:15pm</span>
         </div>
       </div>
     </div>
diff --git a/week-1/2-html-attributes/index.html b/week-1/2-html-attributes/index.html
index dc861fa4f..bf841a271 100644
--- a/week-1/2-html-attributes/index.html
+++ b/week-1/2-html-attributes/index.html
@@ -23,14 +23,16 @@
         <div class="message">
           <div class="message__author">Luke</div>
           <p class="message__content">
-            Let's meet at the iCafe in Merchant City. https://goo.gl/maps/aza4h9nUBhn
+            Let's meet at the iCafe in Merchant City.
+          <p> <a href="https://goo.gl/maps/aza4h9nUBhn">click the location here  </a> </p> 
           </p>
           <span class="message__time">7:35pm</span>
         </div>
         <div class="message">
           <div class="message__author">Won</div>
           <p class="message__content">
-            Ok! https://media.giphy.com/media/l41K4KlVE8dgozf8I/giphy.gif
+            Ok!
+       <img style="width: 400px;" src="https://media.giphy.com/media/l41K4KlVE8dgozf8I/giphy.gif" alt="gif_ok">
           </p>
           <span class="message__time">7:38pm</span>
         </div>
diff --git a/week-1/3-semantic-html/index.html b/week-1/3-semantic-html/index.html
index 3640deaff..d11e34f35 100644
--- a/week-1/3-semantic-html/index.html
+++ b/week-1/3-semantic-html/index.html
@@ -12,30 +12,36 @@
 
   <body>
     <div class="site-wrapper">
-      <div class="site-header">
+      <header class="site-header">
         <div class="site-header__title">Messages</div>
-      </div>
-      <div class="messages">
-        <div class="message">
+      </header>
+      <main class="messages" role="main">
+        <article class="message">
           <div class="message__author">Won</div>
           <p class="message__content">Where should we meet later?</p>
-          <span class="message__time">Mar 25, 2018 7:25pm</span>
-        </div>
-        <div class="message">
+          <time class="message__time" datetime="2018-03-25T19:25">Mar 25, 2018 7:25pm</time>
+        </article>
+        <article class="message">
           <div class="message__author">Luke</div>
-          <p class="message__content">
-            Let's meet at the iCafe in Merchant City. https://goo.gl/maps/aza4h9nUBhn
-          </p>
-          <span class="message__time">Mar 25, 2018 7:35pm</span>
-        </div>
-        <div class="message">
+          <div class="message__content">
+            Let's meet at the iCafe in Merchant City.
+            <p><a href="https://goo.gl/maps/aza4h9nUBhn">click the location here </a></p>
+          </div>
+          <time class="message__time" datetime="2018-03-25T19:35:00">Mar 25, 2018 7:35pm</time>
+        </article>
+        <article class="message">
           <div class="message__author">Won</div>
           <p class="message__content">
-            Ok! https://media.giphy.com/media/l41K4KlVE8dgozf8I/giphy.gif
+            Ok!
+            <img
+              style="width: 400px;"
+              src="https://media.giphy.com/media/l41K4KlVE8dgozf8I/giphy.gif"
+              alt="gif_ok"
+            />
           </p>
-          <span class="message__time">Mar 25, 2018 7:38pm</span>
-        </div>
-      </div>
+          <time class="message__time" datetime="2018-03-25T19:38:00">Mar 25, 2018 7:38pm</time>
+        </article>
+      </main>
       <div id="result" class="result"></div>
     </div>
     <script defer src="/js/3-result.js"></script>
diff --git a/week-1/4-links-scripts/index.html b/week-1/4-links-scripts/index.html
index 303c7fbd2..f8d575a50 100644
--- a/week-1/4-links-scripts/index.html
+++ b/week-1/4-links-scripts/index.html
@@ -4,6 +4,7 @@
     <meta charset="utf-8" />
     <title>4. Adding Links and Scripts - HTML, CSS and Git Exercises</title>
     <meta name="viewport" content="width=device-width, initial-scale=1" />
+    <link rel="stylesheet" href="/week-1/4-links-scripts/css/missing-styles.css" />
   </head>
 
   <body>
@@ -33,5 +34,6 @@
         </div>
       </div>
     </div>
+    <script src="/week-1/4-links-scripts/js/convertUrls.js"></script>
   </body>
 </html>
diff --git a/week-1/5-css-selectors/message-backgrounds.css b/week-1/5-css-selectors/message-backgrounds.css
index ffe483325..ab04c756b 100644
--- a/week-1/5-css-selectors/message-backgrounds.css
+++ b/week-1/5-css-selectors/message-backgrounds.css
@@ -1 +1,12 @@
 /* Add your CSS code below */
+#first-message {
+  background-color: red;
+}
+
+article {
+  background-color: cadetblue;
+}
+
+.message--latest {
+  background-color: yellow;
+}
diff --git a/week-1/6-css-properties/styles.css b/week-1/6-css-properties/styles.css
index ffe483325..8ffad70d5 100644
--- a/week-1/6-css-properties/styles.css
+++ b/week-1/6-css-properties/styles.css
@@ -1 +1,31 @@
 /* Add your CSS code below */
+.link {
+  color: red;
+  text-decoration: none;
+}
+
+.link--map {
+  font-weight: bold;
+}
+.link--gif {
+  font-weight: bold;
+  font-size: small;
+}
+
+.message__time {
+  font-size: 0.9rem;
+}
+.message--unread {
+  border-left: 2px solid blue;
+}
+
+body {
+  padding: auto;
+}
+.message--old {
+  background-color: #ffffff;
+  opacity: 0.3;
+}
+.message {
+  line-height: 300%;
+}
diff --git a/week-1/7-css-box/styles.css b/week-1/7-css-box/styles.css
index 013b94f1e..004ad3e61 100644
--- a/week-1/7-css-box/styles.css
+++ b/week-1/7-css-box/styles.css
@@ -4,3 +4,16 @@
   border-radius: 4px;
   background: #fff;
 }
+
+.countries {
+  background-color: blue;
+}
+.country {
+  border: 1px solid #4491db;
+  width: auto;
+  height: auto;
+  padding: 7px;
+  margin: auto;
+  line-height: 40px;
+  font-size: auto;
+}
diff --git a/week-1/8-advanced-selectors/styles.css b/week-1/8-advanced-selectors/styles.css
index d35c3c371..560c87889 100644
--- a/week-1/8-advanced-selectors/styles.css
+++ b/week-1/8-advanced-selectors/styles.css
@@ -1 +1,12 @@
 /* Try different box model properties below */
+.site-header p {
+  color: white;
+  margin-bottom: -0.5em;
+}
+.site-footer p {
+  font-size: 12px;
+  text-align: center;
+}
+.message:last-child {
+  box-shadow: 4px 4px 0 #dba944;
+}
diff --git a/week-2/10-media-queries/columns.css b/week-2/10-media-queries/columns.css
index 43e80d23c..af0f1edba 100644
--- a/week-2/10-media-queries/columns.css
+++ b/week-2/10-media-queries/columns.css
@@ -1 +1,13 @@
 /* Add your own CSS code below */
+
+@media screen and (max-width: 768px) {
+  .countries {
+    columns: 2;
+  }
+}
+
+@media screen and (min-width: 1200px) {
+  .countries {
+    columns: 3;
+  }
+}
diff --git a/week-2/11-flexbox/flexbox.css b/week-2/11-flexbox/flexbox.css
index 43e80d23c..1a6b8c9cb 100644
--- a/week-2/11-flexbox/flexbox.css
+++ b/week-2/11-flexbox/flexbox.css
@@ -1 +1,19 @@
 /* Add your own CSS code below */
+
+.countries {
+  display: flex;
+}
+.countries--first {
+  display: flex;
+  flex-direction: row-reverse;
+}
+
+.countries--second {
+  display: flex;
+  flex-direction: column;
+}
+
+.countries--third {
+  display: flex;
+  flex-direction: column-reverse;
+}
diff --git a/week-2/12-justify-content/flexbox.css b/week-2/12-justify-content/flexbox.css
index 3c4c7ff18..434bb50b4 100644
--- a/week-2/12-justify-content/flexbox.css
+++ b/week-2/12-justify-content/flexbox.css
@@ -7,3 +7,20 @@
 }
 
 /* Add your own CSS code below */
+
+.countries--first {
+  justify-content: flex-end;
+}
+
+.countries--second {
+  justify-content: space-around;
+}
+
+.countries--third {
+  justify-content: flex-end;
+  flex-direction: column;
+}
+.countries--fourth {
+  justify-content: space-around;
+  flex-direction: column-reverse;
+}
diff --git a/week-2/13-align-items/flexbox.css b/week-2/13-align-items/flexbox.css
index 3675a0df3..e2fa0bd43 100644
--- a/week-2/13-align-items/flexbox.css
+++ b/week-2/13-align-items/flexbox.css
@@ -2,3 +2,21 @@
   display: flex;
 }
 /* Add your own CSS code below */
+.countries--first {
+  align-items: center;
+}
+
+.countries--second {
+  align-items: flex-end;
+  flex-direction: row-reverse;
+}
+
+.countries--third {
+  flex-direction: column;
+  align-items: flex-end;
+}
+
+.countries--fourth {
+  flex-direction: column-reverse;
+  align-items: center;
+}
diff --git a/week-2/14-order/flexbox.css b/week-2/14-order/flexbox.css
index ed621b793..8aaf40471 100644
--- a/week-2/14-order/flexbox.css
+++ b/week-2/14-order/flexbox.css
@@ -3,3 +3,47 @@
 }
 
 /* Add your own CSS code below */
+.countries--first .country:nth-child(1) {
+  order: 2;
+  background-color: lawngreen;
+}
+
+.countries--second .country:nth-child(1) {
+  order: 3;
+  background-color: lawngreen;
+}
+
+.countries--second .country:nth-child(4) {
+  order: 2;
+  background-color: lawngreen;
+}
+
+.countries--second .country:nth-child(5) {
+  order: 5;
+  background-color: lawngreen;
+}
+
+.countries--third .country:nth-child(5) {
+  order: -1;
+  background-color: lawngreen;
+}
+
+.countries--third .country:nth-child(4) {
+  order: 1;
+  background-color: lawngreen;
+}
+
+.countries--third .country:nth-child(3) {
+  order: 2;
+  background-color: lawngreen;
+}
+
+.countries--third .country:nth-child(2) {
+  order: 3;
+  background-color: lawngreen;
+}
+
+.countries--third .country:nth-child(1) {
+  order: 4;
+  background-color: lawngreen;
+}
diff --git a/week-2/15-align-self/flexbox.css b/week-2/15-align-self/flexbox.css
index ed621b793..befa8755c 100644
--- a/week-2/15-align-self/flexbox.css
+++ b/week-2/15-align-self/flexbox.css
@@ -3,3 +3,39 @@
 }
 
 /* Add your own CSS code below */
+.countries--first :nth-child(3) {
+  align-self: flex-end;
+}
+
+.countries--second {
+  flex-direction: row;
+  align-items: center;
+}
+.countries--second :nth-child(3) {
+  align-self: flex-end;
+}
+
+.countries--third :nth-child(1) {
+  align-self: flex-start;
+}
+.countries--third :nth-child(2) {
+  align-self: flex-end;
+}
+.countries--third :nth-child(3) {
+  align-self: flex-end;
+}
+
+.countries--third :nth-child(4) {
+  align-self: flex-end;
+}
+.countries--third :nth-child(5) {
+  align-self: flex-start;
+}
+.countries--fourth {
+  flex-direction: column;
+  align-items: flex-start;
+}
+.countries--fourth :nth-child(5) {
+  flex-direction: column;
+  align-self: center;
+}
diff --git a/week-2/16-more-flexbox/flexbox.css b/week-2/16-more-flexbox/flexbox.css
index ed621b793..25dfe9372 100644
--- a/week-2/16-more-flexbox/flexbox.css
+++ b/week-2/16-more-flexbox/flexbox.css
@@ -3,3 +3,65 @@
 }
 
 /* Add your own CSS code below */
+.countries--first {
+  justify-content: flex-end;
+  align-items: flex-end;
+}
+
+.countries--second {
+  align-items: flex-end;
+  justify-content: center;
+  flex-direction: row-reverse;
+}
+
+.countries--third {
+  justify-content: center;
+  align-items: flex-start;
+}
+
+.countries--third .country--brazil {
+  align-self: flex-end;
+}
+
+.countries--fourth {
+  flex-direction: column;
+  justify-content: center;
+  align-items: center;
+}
+.countries--fourth .country--brazil {
+  align-self: flex-end;
+}
+
+.countries--fourth .country--croatia {
+  align-self: flex-end;
+}
+
+.countries--fourth .country--uganda {
+  align-self: flex-end;
+}
+
+.countries--fifth {
+  flex-flow: column-reverse wrap;
+  justify-content: space-around;
+}
+
+.countries--fifth .country--brazil {
+  align-self: flex-end;
+}
+
+.countries--fifth .country--croatia {
+  align-self: flex-end;
+}
+
+.countries--fifth .country--ethiopia {
+  align-self: flex-end;
+}
+
+.countries--fifth .country--laos {
+  order: 1;
+  align-self: flex-end;
+}
+
+.countries--fifth .country--uganda {
+  align-self: center;
+}
diff --git a/week-2/17-nav-menu/styles.css b/week-2/17-nav-menu/styles.css
index f04f4c7ba..cc5515ba4 100644
--- a/week-2/17-nav-menu/styles.css
+++ b/week-2/17-nav-menu/styles.css
@@ -1 +1,22 @@
 /* Write your media queries and flexbox CSS below */
+@media only screen and (min-width: 480px) {
+  .site-header__nav {
+    display: flex;
+  }
+}
+
+@media (min-width: 700px) {
+  .site-header {
+    display: flex;
+    align-items: center;
+    flex-direction: row;
+  }
+}
+
+@media (min-width: 992px) {
+  .site-header {
+    display: flex;
+    align-items: center;
+    justify-content: space-between;
+  }
+}
diff --git a/week-2/18-git-merge/styles.css b/week-2/18-git-merge/styles.css
index 0051cdbaf..b0988b252 100644
--- a/week-2/18-git-merge/styles.css
+++ b/week-2/18-git-merge/styles.css
@@ -1,6 +1,6 @@
 /* Add your own CSS code below */
 .link {
-  color: #4491db;
+  color: orange;
   font-weight: 700;
   text-decoration: none;
 }