main.css

html, body{
  margin: 0;
  padding: 0;
  overflow: hidden;
}

h1, h2{
  font-family: sans-serif;
  color: #B3B3B3;
  position: absolute;
  z-index: 100;
  margin-left:25px;
}
h2{
  top: 50px;
}

canvas{
  border: solid 2px #000000;
}
ul{
    position: absolute;
    z-index: 100;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    margin: auto;
}
ul li{
  font-family: sans-serif;
  font-size: 30px;
  display: inline-block;
  color: #FFFFFF;

}

.range {
  -webkit-appearance: none;
  -moz-appearance: none;
  width: 200px;
  margin-top: 10px;
  transform: translate(-50%, -50%);
  position: absolute;
  top: 115px;
  left: 125px;
  z-index: 90;
}

input[type=range]::-webkit-slider-runnable-track {
  -webkit-appearance: none;
  background: #B3B3B3;
  height: 2px;
}

input[type=range]:focus {
  outline: none;
}

input[type=range]::-moz-range-track {
  -moz-appearance: none;
  background: #B3B3B3;
  height: 2px;
}

input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  border: 2px solid;
  border-radius: 50%;
  height: 25px;
  width: 25px;
  max-width: 80px;
  position: relative;
  bottom: 11px;
  background-color: #FFFFFF;
  cursor: -webkit-grab;
}

input[type=range]::-moz-range-thumb {
  -moz-appearance: none;
  border: 2px solid;
  border-radius: 50%;
  height: 25px;
  width: 25px;
  max-width: 80px;
  position: relative;
  bottom: 11px;
  background-color: #FFFFFF;
  cursor: -moz-grab;
}


.range.blue::-webkit-slider-thumb {
   border-color: #B3B3B3;
}

.range.blue::-moz-range-thumb {
   border-color: rgb(59,173,227);
}

input[type=range]::-webkit-slider-thumb:active {
  cursor: -webkit-grabbing;
}

input[type=range]::-moz-range-thumb:active {
  cursor: -moz-grabbing;
}