html, body {
  background-color: #070709;
  width: 100%;
  height:100%;
  display: flex;
  justify-content: center;
  align-items: center;
  /* leave it to hide the scrollbars */
  /*overflow: hidden;*/
}

canvas {
  display: block;
/*  position: absolute;*/
/*  top: 0;*/
/*  left: 0;*/
/*  right: 0;*/
/*  bottom: 0;*/
  width: 100%;
  height: 100%;
}