body {
  margin: 0;
  padding: 0;
  width: auto;
  height: 100vh;
  background: rgb(30, 30, 30);
}
canvas {
  margin: auto;
  position: absolute;
  left: -50%;
  right: -50%;
  top: -50%;
  bottom: -50%;
  display: block;
  height: auto;
  width: auto;
  max-width: 99vh;
  max-height: 99vh;
  border-radius: 10px;
  box-shadow: rgba(50, 50, 93, 0.25) 0px 13px 27px -5px, rgba(0, 0, 0, 0.3) 0px 8px 16px -8px;
}