style.css

body {
  background-color: black;
  color: #BBBBBB;
  font-family: helvetica, arial, verdana, sans-serif;
  text-align: center;
}

a:link    { color: #7777BB; }
a:visited { color: #BB77BB; }
a:hover   { color: #8888BB; }
a:active  { color: #7777BB; }

input[type="range"] {
  width: 100%;
}

#main_canvas {
  touch-action: none;
}

@media screen and (orientation: portrait) {
  #content {
    text-align: center;
  }
  #main_canvas {
    width: 100%;
  }
  #display {
    padding-left:  30px;
    padding-right: 30px;
  }
  #controls {
    padding-top:    20px;
    padding-left:   13%;
    padding-right:  13%;
    padding-bottom: 50px;
  }
}

@media screen and (orientation: landscape) {
  #content {
    text-align: center;
    display: inline-block;
  }
  #main_canvas {
    height: 100%;
  }
  #display {
    height: 85vh;
    padding-left:  35px;
    padding-right: 35px;
    float: left;
  }
  #controls {
    padding-right:  40px;
    padding-bottom: 50px;
    vertical-align: top;
    text-align: left;
    overflow: hidden;
  }
  @-moz-document url-prefix() {
    @media only screen and (min-width: 900px) {
    /*
      TODO: For some reason, Firefox on desktop (not mobile!) doesn't work
               properly unless something like this is specified.
    */
      #controls {
        float: left;
      }
    }
  }
}