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

canvas {
  display: block;
}

slider {
  -webkit-appearance: none;
  width: 100%;
  height: 25px;
  background: #d3d3d3;
  outline: none;
  -webkit-transition: .2s;
  transition: opacity .2s;
}

button {
  background: #FFCC00;
  width: 100px;
  text-align: left;
}