style.css

body{ margin: 0; font-family: helvetica; }
button, select { outline: none;}
.node { fill: black; }
#controls{ 
  text-align: center;
  font-size: 20px;
  font-weight: bold;
}
#source{
  position: absolute;
  right: 10px;
  bottom: 10px;
}
#title{
  width: 100%;
}
.vis{
  position: absolute;
  left: 0px;
  top: 0px;
  z-index: -10;
}
#title h1{
  text-align: center;
  margin: 10px;
}
circle { stroke: none; }
.node.active circle {
  stroke-width: 1;
  stroke: white;
}
.node.highlighted circle { 
  stroke: black;
  stroke-width: 15;
  stroke-opacity: 0.5;
}
.tooltip{ display: none; }
.tooltip .bg{ opacity: 0.7; }
.tooltip text{
  fill: white;
}
active.tooltip{
  display: inherit;
}
.node text{
  text-anchor: middle;
  fill: black;
}
select{ font-size: 20px; }
.sort-by{
/*        border: 1px solid #999;
  background-color: green;
  -webkit-appearance: none;
  padding: 5px;
  border-radius: 0px;*/
}
.share-left{ margin-top: 20px; position: absolute; left: 20px;}
.share-right{ margin-top: 20px; position: absolute; right: 10px;}
.fb-share-right{ margin-top: 50px; position: absolute; right: 35px;}
@media (max-width: 900px) {
  h1, #controls{ 
    float: left;
    margin-left: 20px;
  }
  .share-left{
    left: inherit;
    right: 20px;
    top: 60px;
  }
}
@media(max-width: 400px){
  .share-left, .share-right, .fb-share-right{
    display: none;
  }
  h1{
    display: none;
  }
  #controls{
    font-size: 10px;
    position: absolute;
    top: inherit;
    bottom: 5px;
  }
  #controls select{ width: 100px;}
  #source{
    display: none;
  }
}