html,
body {
  width: 100%;
  height: 100%;
}
body {
  background: #000;
}
* {
  margin: 0px;
  padding: 0px;
}
.stage {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-repeat: no-repeat;
  background-position: center center;
}
.pool {
  display: none;
}
.controller {
  position: absolute;
  left: 0px;
  bottom: 0px;
  opacity: 0;
}
.controller:hover {
  opacity: 0.8;
}
.controller .label {
  display: inline-block;
  width: 100px;
}
.controller2 {
  top: 0px;
  height: 30px;
}
.range {
  width: 400px;
}