body {
  font-family: sans-serif;
  margin: 0px;
  padding: 0px;
  padding-top: 64px;
  background-size: cover;
  background-repeat: no-repeat;
}

ul,ul>li {
  list-style: none;
  padding: 0;
  margin: 0;
}

.navigation {
  opacity: .9;
  float: left;
  margin: 64px;
  margin-top: 0px;
  text-align: center;
  width: 192px;
}

.navigation li {
  display: block;
  background-color: rgb(255, 255, 255);

  font-weight: bold;
  font-size: 24px;
  color: #333;
  line-height: 64px;
}

.navigation h1 {
  margin: 0px;
  padding: 0px;

  font-size: 40px;
  line-height: 64px;
  color: #333;

  background-color: rgb(255, 255, 255);
}

.navigation a {
  display: block;
  line-height: 64px;
  background-color: rgb(51, 51, 51);
  color: rgb(255, 255, 255);
  text-decoration: none;
}

.navigation a:hover {
  color: #333;
  background-color: rgb(255, 255, 255);
}

.navigation .section {
  background-color: rgb(0, 0, 0);
  height: 60px;
  color: #FFF;
}

.navigation .image {
  height: 192px;
  width: 192px;
  background: black;
  background-image: url(../img/gears.jpg);
  background-size: cover;
}

.navigation .image a {
  height: 192px;
  background-color: transparent;
}

.content {
  margin: 0px 64px 64px 320px;
  padding: 64px;
  max-width: 640px;
  background-color: #FFF;
  opacity: .9;
}

.content pre {
  background-color: #000;
  color: #e2e2e2;
  padding: 16px;
}

@media only screen and (max-width: 960px) {
    /* phones */

  .navigation {
    float: none;
  }

  .content {
    max-width: 100%;
    margin: 0px;
    padding: 8px;
  }
}

@media only screen and (max-width: 767px) and (orientation: portrait) {
    /* portrait phones */
}