.full-page-background 
{
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100dvh;
    background-size: cover;
    background-position: center;
    height: 100vh;
    z-index: -1;
    will-change: filter;
    backface-visibility: hidden; 
    transform: translateZ(0);
}