body { background-color: #000; }
#roll {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
#particles {
    position: fixed;
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    z-index: -999;
}
:root {
    --col-particle: #fff;
    --col-particle-stroke: #212121;
    --col-particle-stroke-hover: #c0c0c0;
}