scrolling effect_Lumeng Li.css

html {
    height: 100vh;
  }
  
  body {
    height: 500vh;
    /*background: #000;*/
  }

  .container_canvas {
    background-color: aquamarine;
  }
  
  canvas {
    position: fixed;
    left: 50%;
    top: 50%; 
    transform: translate(-50%, -50%);
    max-width: 100vw;
    max-height: 100vh;

   
  }