* {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
  box-sizing: border-box;
}

body {
  background: #333;
}

canvas {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translateY(-50%) translateX(-50%);
  -webkit-transform: translateY(-50%) translateX(-50%);
}

