body{
  margin:0px;
  padding:0px;
  color: #555;
  background-color:#fafafa;
  font-family:'Roboto';
}

#menu
{
  padding:0;
  margin: 20px 0 0 10px;
  list-style-type:none;
  font-size:16px;
  color:#555;
  position: fixed;
}

#menu li
{
  padding:7px 10px 7px 10px;
  cursor: pointer;
}

#menu .selected
{
  background-color:#ddd;
}
a, a:hover
{
  color:#555;
  text-decoration: none;
}


header {
  font-size: 50px;
}
pre {
  line-height: 1.5em;
  font-size: 20px;
  font-family: Raleway,HelveticaNeue,"Helvetica Neue",Helvetica,Arial,sans-serif;
}

article {
  margin: 2em 0 2em 0;
  height: 100%;
}

article:first-of-type {
  margin-top: 0px;
}

iframe{
  position: absolute;
  right: 5px;
  top: 26px;

}

@media (max-width: 600px) {
.nine{
  padding-top: 8px;
}

  #menu {
    font-size: 20px;
    position: relative;
    margin: 0px;
    position: fixed;
    width: 100%;
    display: flex;

  }
  iframe{
    position: absolute;
    right: 0px;
    top: 86px;

  }
  ul{
  }
  #menu li {
    padding: 18px;
    width: 33%;
    text-align: center;
    background-color: white;
  }
  header {
    padding-top: 60px;
    margin-top: -60px;
  }
  div.nine{
    width: 400px;
    margin-left: 40px;

  }
  article:first-of-type {
    margin-top: 32px;
  }
}