html, body {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  padding: 0;
  margin: 0;
  background: #380073;
}

canvas {
  outline: none;
  width: auto;
  height: auto;
  flex:1;
  display: block;
  max-height: 100%;
  max-width: 100%;
}