body::after {
    content: "";
    background: url('/icons/navbar.png')left center;
    background-size:cover;
    opacity: 0.2;
    top: 0rem;
    left: 30rem;
    bottom: 0;
    right: -20rem;
    position: absolute;
    z-index: -1;  
    -webkit-filter: grayscale(1); /* Old WebKit */
    filter: grayscale(1);
  }