body::before {
    content: "";
    background-image: url('/images/watermark.png');
    background-size: 10%;
    background-repeat: repeat;
    background-position: top left;
    opacity: 0.1;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
}