body {
  background-color: #000;
  font-family: 'Open Sans', sans-serif;
  color: #AAA;
  margin: 0;
  overflow: hidden;
  font-size: 12px;
}
canvas {
  position: absolute;
  z-index: 0;
}
.btn {
  position: absolute;
  left: 20px;
  top: 20px;
  width: 50px;
  text-align: center;
  z-index: 1;
  border: 1px solid rgba(255,255,255,.3);
  padding: 8px 8px;
  /*border-radius: 4px;*/
  cursor: pointer;
  text-transform: uppercase;
  transition: all .3s;
} 
.btn:hover {
  background-color: rgba(255,255,255,.1);
  color: #fff;
}
.credit {
  position: absolute;
  z-index: 1;
  left: 20px;
  bottom: 20px;
}
a {
  color: rgba(255,255,255,.5);
  transition: all .3s;
  text-decoration: none;
}
a:hover {
  color: rgba(255,255,255,.8);
}