styles.css

html {
  font-size: 62.5%;
}

body {
  background-color: #ffffff;
  color: #000000;
  font-family: Georgia, serif;
  font-size: 2rem;
  line-height: 2.8rem;
  margin: 0;
  padding: 0;
}

a > img {
  border: none;
}

#wrapper {
  margin: 0 auto 4rem;
  max-width: 740px;
}

nav {
  margin: 4rem 2rem;
  overflow: hidden;
}

#rails-logo {
  display: block;
  float: left;
}

nav ul {
  float: right;
  font-size: 1.4rem;
  list-style: none;
  margin: 2.3rem 0 0;
  padding: 0;
}

nav ul li {
  display: inline;
  margin: 0 0 0 3rem;
}

nav ul li a {
  border-bottom: 0.2rem solid #cc0000;
  color: #cc0000;
  font-weight: bold;
  padding-bottom: 0.1rem;
  text-decoration: none;
}

nav ul li a:hover {
  border-bottom: 0.2rem solid #000000;
  color: #000000;
}

main {
  margin: 0 2rem;
}

article {
  margin: 2rem 0 4rem;
}

article header {
  margin: 0 0 0.5rem 0;
}

article header h2 {
  font-weight: normal;
  font-size: 3.4rem;
  line-height: 3.8rem;
  margin-bottom: 0;
}

article header h2 a {
  color: #000000;
  text-decoration: none;
}

article header h2 a:hover {
  text-decoration: underline;
}

article header p {
  color: #777777;
  font-size: 1.6rem;
  margin: 0.5rem 0;
}

article header p a {
  color: #cc0000;
  text-decoration: none;
}

article header p a:hover {
  text-decoration: underline;
}

article section {
  font-size: 2rem;
  margin: 1rem 0;
}

article section h2 {
  font-size: 2.4rem;
  margin: 2rem 0 1rem;
}

article section h3 {
  font-size: 2rem;
  font-weight: normal;
  margin: 1rem 0 0.5rem 0;
}

article section p {
  font-size: 2rem;
  margin: 0 0 1.5rem 0;
}

article section ul, article section ol {
  margin: 0.5em 0 1.5rem 0;
  padding: 0 0 0 2.5rem;
}

article section li {
  font-size: 2rem;
  margin: 0 0 0.5rem 0;
}

article section a {
  color: #cc0000;
  text-decoration: none;
}

article section a:hover {
  text-decoration: underline;
}

article section img {
  max-width: 100%;
}

article section pre {
  background-color: #eeeeee;
  font-size: 1.5rem;
  line-height: 2.4rem;
  margin: 2rem 0;
  overflow: auto;
  padding: 1.5rem 2rem !important;
}

article section code, article section tt {
  font-family: Courier New, Courier, mono;
}

article section p code, article section p tt {
  color: #666666;
  overflow: auto;
  white-space: nowrap;
}

article section pre code {
  color: #666666;
  font-size: 1.5rem;
}

article section blockquote {
  margin: 1rem 2rem;
}

article section twitterwidget + p,
article section iframe + p {
  margin-top: 1.5rem;
}

blockquote.twitter-tweet {
  display: inline-block;
  padding: 16px;
  margin: 0 0 1.5em 0;
  max-width: 468px;
  border: #ddd 1px solid;
  border-top-color: #eee;
  border-bottom-color: #bbb;
  border-radius: 5px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
  font: bold 14px/18px Helvetica, Arial, sans-serif;
  color: #000;
}

blockquote.twitter-tweet p {
  font: normal 18px/24px Georgia, "Times New Roman", Palatino, serif;
  margin: 0 5px 10px 0;
}

blockquote.twitter-tweet a[href^="https://twitter.com"] {
  font-weight: normal;
  color: #666;
  font-size: 12px;
}

nav.pagination {
  margin: 0 0 2em;
  overflow: hidden;
}

nav.pagination a {
  border-bottom: 0.2rem solid #cc0000;
  color: #cc0000;
  font-weight: bold;
  padding-bottom: 0.1rem;
  text-decoration: none;
}

nav.pagination a:hover {
  border-bottom: 0.2rem solid #000000;
  color: #000000;
}

nav.pagination .previous {
  float: left;
}

nav.pagination .next {
  float: right;
}

@media only screen and (max-width: 640px) {
  nav {
    margin: 2rem 2rem 3rem;
  }

  nav ul li {
    margin: 0 2rem 0 0;
  }
}

@media only screen and (max-width: 480px) {
  nav {
    margin: 2rem 1.5rem 1rem;
  }

  #rails-logo {
    float: none;
  }

  nav ul {
    float: none;
    margin: 1.5rem 0 0.5rem;
  }

  nav ul li {
    margin: 0 2rem 0 0;
  }

  main {
    margin: 0 1.5rem;
  }

  article {
    margin: 1.5rem 0 3rem;
  }

  article header h2 {
    font-size: 2.2rem;
    line-height: 2.6rem;
  }

  article section {
    font-size: 1.2rem;
    line-height: 1.6rem;
  }

  article section h2 {
    font-size: 1.9rem;
    line-height: 2.3rem;
  }

  article section h3 {
    font-size: 1.6rem;
    line-height: 2.1rem;
  }

  article header p {
    font-size: 1.2rem;
    line-height: 1.6rem;
    margin: 0.25rem 0;
  }

  article section p {
    font-size: 1.6rem;
    line-height: 2.1rem;
    margin: 0 0 1.5rem 0;
  }

  article section ul, article section ol {
    margin: 0.5em 0 1.5rem 0;
    padding: 0 0 0 2.1rem;
  }

  article section li {
    font-size: 1.6rem;
    line-height: 2.1rem;
  }

  article section blockquote {
    margin: 0.5rem 1.5rem;
  }

  article section pre {
    font-size: 1.2rem;
    line-height: 1.8rem;
    margin: 1rem 0;
    overflow: auto;
    padding: 0.7rem 1rem !important;
  }

  article section pre code {
    font-size: 1rem;
    line-height: 1.2rem;
  }
}