body {
    align-items: center;
    display: flex;
    height: 100vh; /* Fallback for browsers that do not support Custom Properties */
    justify-content: center;
  }
  body,
  html {
    margin: 0;
    overflow: hidden;
    padding: 0;
  }
  canvas { 
    max-width: 100%;
    max-height: 100%;
    display: inline-block; /* Instead of display: block; */
    margin: 0 auto;
    vertical-align: middle;
    touch-action: none;
  }