* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  position: relative;
}
canvas {
  display: block;
}
span {
  position: absolute;
  top: 20px;
  left: 20px;
  background-color: red;
  border-radius: 50%;
  width: 25px;
  height: 25px;
}
.blue {
  top: 60px;
  left: 20px;
  background-color: blue;
}
.yellow {
  top: 100px;
  left: 20px;
  background-color: yellow;
}
.green {
  top: 140px;
  left: 20px;
  background-color: green;
}
.black {
  top: 180px;
  left: 20px;
  background-color: black;
}
.icon-clean {
  position: absolute;
  top: 20px;
  right: 40px;
}