body { 
  display: flex;
  height: 100vh;
  background: snow;
  justify-content: center;
  align-items: center;
}

canvas {
    position: fixed;
    top:0; 
/*    border-radius: 50%;*/
/*    box-shadow: 0 8px 24px rgba(0,0,0,.3);*/
/*    display: inline-block;*/
}