html, body {
  height: 100%;
}

body {
  margin: 0;
  padding: 0;
  font-family: helvetica, arial, sans;
  font-size: 12px;
  display: flex;
  justify-content: center;
  align-items: center;
}

canvas {
  display: block;
  //margin: 0 auto 0 auto;
  z-index: -1;
}

.Slider{
  -webkit-appearance: none;
  position: relative;
  margin-top: 25px;
  margin-left: calc(50% - 50px);
  margin-bottom: 20px;

  background: none;
  height:16px;
  width:200px;
  border-radius: 8px;
  border: 2px solid #ffffff;
}

.Slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width:12px;
  height:12px;
  border-radius: 6px;
  background: #ffffff;
  outline: none;
}