#particles{
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    /*
    background-color: #000;
    background-image: url('');
    background-size: cover;
    background-position: 50% 50%;
    background-repeat: no-repeat;*/
    position: absolute;
    z-index: -100;
  }