html, body {
  margin: 0;
  padding: 0;
  background-color: #000
}

canvas {
    padding: 0;
    margin: auto;
    display: block;
    width: 1000px;
    height: 1000px;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}