* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  html,
  body {
    overflow: hidden;
  }
  
  #three-canvas {
    position: fixed;
    top: 0;
    left: 0;
    outline: none;
  }
  
  #file-input {
    z-index: 1;
    position: absolute;
  }