* { margin: 0; padding: 0; box-sizing: border-box; }
  html, body {
    height: 100%;
    width: 100%;
    background: transparent !important;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
  }
  canvas {
    display: block;
    width: 100%;
    height: 100%;
  }