.site-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 130vh;
    height: 130lvh;
    z-index: 0;
    pointer-events: none;
}

body > header,
body > main,
body > footer {
    position: relative;
    z-index: 1;
}