.grain {
    height: 100lvh;
    overflow: hidden;
    pointer-events: none;
    z-index: 9999;
    left: 0;
    position: fixed;
    top: 0;
    width: 100%;
}
.grain::after {
    background-image: url(../assets/images/ui/grain.png);
    content: "";
    height: 400vh;
    height: 400lvh;
    left: -200vw;
    opacity: 1;
    position: absolute;
    top: -200vh;
    top: -200lvh;
    width: 400vw;
}