style.css

/* -*- css-indent-offset: 2; -*- */
:root {
  --light:                    #FAFAFA;
  --lighter:                  #CCC;
  --darker:                   #111;
  --dark:                     #222;
  --dark-accent:              #444;
  --dark-lighter:             #888;
  --link:                     #07A;
  --link-visited-light-theme: #941352;
  --link-visited-dark-theme:  #9f4f76;

  color-scheme: light dark;
}

html {
  height: 100%;
}

body {
  min-height: 100%;
  display: grid;
  grid-template-rows: 1fr auto;

  margin: 0 auto;
  max-width: 672px;
  line-height: 1.6;
  font-size: 18px;
  color: var(--dark);
  background-color: var(--light);
  padding: 0 10px;
  font-family: "Open Sans";
}

@media screen and (min-width: 680px) {
  main {
    margin: 40px 0;
  }
}

h1, h2 {
  line-height: 1.2;
}

footer {
  grid-row-start: 2;
  grid-row-end: 3;
  color: var(--dark-lighter);
  font-size: 9px;
}

a {
  color: var(--link);
}
a:visited {
  color: var(--link-visited-light-theme);
}
footer > a {
  color: var(--dark-lighter) !important;
}

blockquote {
  background: var(--light);
  border-left: 10px solid var(--dark-lighter);
  margin: 1.5em 10px;
  padding: 0.5em 10px;

  font-family: monospace;
}
blockquote p {
  display: inline;
}

@media screen and (min-width: 400px) {
  blockquote {
    display: table;
  }
  blockquote > * {
    display: table-cell;
  }
  blockquote > .name {
    padding-right: 8px;
  }
}

/* Dark mode *****************************************************************/
@media (prefers-color-scheme: dark) {
  body {
    color: var(--light);
    background: var(--dark);
  }

  footer{
    color: var(--lighter);
  }

  blockquote {
    background: var(--darker);
    color: var(--lighter);
    border-left-color: var(--dark-accent);
  }

  a:visited {
    color: var(--link-visited-dark-theme);
  }
}