@font-face {
  font-family: monospace;
  font-weight: normal;
  font-style: normal;
}
* {
  box-sizing: border-box;
}
html {
  height: 100%;
}
body {
  background-color: #ffffff;
  margin: 0px;
  height: 100%;
  color: #555;
  font-family: 'inconsolata';
  font-size: 15px;
  line-height: 18px;
  overflow: hidden;
}
h1 {
  margin-top: 30px;
  margin-bottom: 40px;
  margin-left: 20px;
  font-size: 25px;
  font-weight: normal;
}
h2 {
  font-size: 20px;
  font-weight: normal;
}
a {
  color: #2194CE;
  text-decoration: none;
}
#panel {
  position: fixed;
  left: 0px;
  width: 310px;
  height: 100%;
  overflow: auto;
  background: #fafafa;
}
#panel #content {
  padding: 0px 20px;
}
#panel #content .link {
  color: #2194CE;
  text-decoration: none;
  cursor: pointer;
}
#panel #content .selected {
  color: #ff0000;
}
#panel #content .link:hover {
  text-decoration: underline;
}
#viewer {
  position: absolute;
  border: 0px;
  left: 310px;
  width: calc(100% - 310px);
  height: 100%;
  overflow: auto;
}
#button {
  position: fixed;
  bottom: 20px;
  left: 20px;
  padding: 8px;
  color: #fff;
  background-color: #555;
  opacity: 0.7;
}
#button:hover {
  cursor: pointer;
  opacity: 1;
}

/* mobile */

#expandButton {
  display: none;
  position: absolute;
  right: 20px;
  top: 12px;
  width: 32px;
  height: 32px;
}
#expandButton span {
  height: 2px;
  background-color: #2194CE;
  width: 16px;
  position: absolute;
  left: 8px;
  top: 10px;
}
#expandButton span:nth-child(1) {
  top: 16px;
}
#expandButton span:nth-child(2) {
  top: 22px;
}
@media all and ( max-width: 640px) {
  h1 {
    margin-top: 20px;
    margin-bottom: 20px;
  }
  #panel {
    position: absolute;
    left: 0;
    top: 0;
    height: 480px;
    width: 100%;
    right: 0;
    z-index: 100;
    overflow: hidden;
    border-bottom: 1px solid #dedede;
  }
  #content {
    position: absolute;
    left: 0;
    top: 60px;
    right: 0;
    bottom: 0;
    font-size: 17px;
    line-height: 22px;
    overflow: auto;
  }
  #viewer {
    position: absolute;
    left: 0;
    top: 56px;
    width: 100%;
    height: calc(100% - 56px);
  }
  #expandButton {
    display: block;
  }
  #panel.collapsed {
    height: 56px;
  }
}