body {
  background: white;
  color:black;
  text-align:center;
  position: fixed;
}
.clock {
  height: 100%;
  padding-top: 100px;
  text-align: center;
  font-size: 100px;
}

#hour{
  width:10vmin;
  height:10vmin;
  position:fixed;
  top:50vh;
  left:50vw;
}

#minute{
  width:10vmin;
  height:10vmin;
  position:fixed;
  top:20vh;
  left:60vw;
}

#second{
  width:10vmin;
  height:10vmin;
  position:fixed;
  top:10vh;
  left:20vw;
}