canvas {
  width: 100%;
  height: 100%;
  display: block;
  position: fixed;
  top: 0;
  left: 0;
  z-index: -9999;
}
   body {
            background-color: white;
            overflow: hidden;
            display: flex;
            justify-content: center;
            align-items: center;
            width: 100vw;
            height: 100vh;
        }
  

html, body { 
  margin: 0;

}