style.css

@import url(https://fonts.googleapis.com/css?family=Roboto:400,500,700,300,100);

* {
  box-sizing: border-box;
}

body {
  font-family: "Roboto", helvetica, arial, sans-serif;
  margin: 0;
  padding: 0;
  min-height: 100%;
}

#background {
  height: 100%;
  width: 100%;
  position: fixed;
  /* Permalink - use to edit and share this gradient: http://colorzilla.com/gradient-editor/#545454+2,818181+100 */
  background: rgb(84, 84, 84); /* Old browsers */
  background: -moz-linear-gradient(
    45deg,
    rgba(84, 84, 84, 1) 2%,
    rgba(129, 129, 129, 1) 100%
  ); /* FF3.6-15 */
  background: -webkit-linear-gradient(
    45deg,
    rgba(84, 84, 84, 1) 2%,
    rgba(129, 129, 129, 1) 100%
  ); /* Chrome10-25,Safari5.1-6 */
  background: linear-gradient(
    45deg,
    rgba(84, 84, 84, 1) 2%,
    rgba(129, 129, 129, 1) 100%
  ); /* W3C, IE10+, FF16+, Chrome26+, Opera12+, Safari7+ */
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#545454', endColorstr='#818181',GradientType=1 ); /* IE6-9 fallback on horizontal gradient */
}

nav {
  position: fixed;
  width: 13em;
  text-align: center;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.3);
  overflow: auto;
}

nav h1 {
  color: white;
  background: rgba(0, 0, 0, 0.2);
  padding: 1.3em 0;
  margin: 0;
}

#tabs ol a,
nav h3,
nav h3 a {
  display: block;
  padding: 0.5em;
  padding-left: 2em;
  text-decoration: none;
  color: white;
}

nav h3,
nav h3 a {
  text-align: left;
  margin: 0;
  padding: 0;
}

nav h3 {
  padding: 0.6em;
  margin-top: 0.9em;
}

#tabs ol,
#tabs {
  list-style-type: none;
  margin: 0;
  margin-bottom: 1.5em;
  padding: 0;
  text-align: left;
}

#tabs ol li a:hover,
nav ol li a.selected {
  background: rgba(255, 255, 255, 0.1);
  color: #ffffff;
}

.hiddenTab {
  display: none;
}

.banner {
  max-width: 100%;
  margin: 0;
  padding: 0;
}

.selected {
  background: rgba(255, 255, 255, 0.2);
  color: #ffffff;
}

.preview {
  min-height: 15rem;
  max-width: 100%;
  margin: 0.5em 0;
}

.clickable {
  cursor: pointer;
}

#content {
  position: absolute;
  right: 0;
  left: 13em;
  min-width: 20em;
  background-color: #f5f5f5; /* light grey */
  padding-bottom: 10rem;
}

#content article {
  max-width: 50em;
  margin: 0 auto;
}

#content h1 {
  font-size: 2em;
}

#content p {
  font-size: 1.1em;
}

#content > section > p {
  max-width: 35em;
}

#content pre,
#content details > p {
  background: rgba(84, 84, 84, 0.2);
  padding: 1em;
}

#content details > summary {
  cursor: pointer;
  margin: 0.5em;
}

.bullet-table {
  width: 100%;
  font-weight: bold;
}

.bullet-table td {
  padding: 0.5em 2rem;
}

.links {
  list-style-type: none;
  padding: 0;
  margin-bottom: 0;
  font-size: 1.1em;
}

.links li {
  margin-top: 0.5em;
}

.logos a {
  height: 8rem;
  display: inline-block;
  margin: 0.5rem 1.5rem 0.5rem 0;
}

.logos a img {
  height: 100%;
  margin: auto;
}

.logos .wide {
  width: 18rem;
}

.logos li {
  display: inline-block;
}

.circle {
  border-radius: 50%;
}

h1,
h2,
h3 {
  margin: 0 0 0.2em 0;
  color: rgba(0, 0, 0, 0.6);
}

#content h2 {
  margin-top: 1em;
}

article > h1 > a {
  color: inherit;
  text-decoration: none;
}

/* Navigate to slightly above anchors in article titles */
article > h1 > a:before {
  content: "";
  display: block;
  position: relative;
  width: 0;
  height: 10rem;
}

@media screen and (max-width: 800px) {
  article > h1 > a:before {
    height: 0rem;
  }
  #content article {
    padding: 1em;
  }
  #content {
    width: 100%;
    right: 0;
    padding-top: 0;
  }
  .logos {
    text-align: center;
  }
}