#background {
    position: fixed;
    display: grid; 
    height: 100%;
    width: 100%;
    z-index: -1000;
    box-shadow: inset 0 0 5rem rgba(0, 0, 0, .5);
}

#background::before {
    content: "";
    clip-path: polygon(0 0,100% 0,100% 100%,0 calc(100% - 70px));
    background: linear-gradient(10deg, rgba(248, 165, 110, 0.7), rgba(135, 84, 59, 0.7), rgba(155, 89, 70, 0.7)) fixed;
    /*background: linear-gradient(10deg, #fdf2ab, #97beae, #505c60) fixed;*/
}

#background::after {
    content: "";
    clip-path: polygon(0 0,100% 70px,100% 100%,0 100%);
    margin-top: calc(10px - 70px);
    background: linear-gradient(-190deg, rgba(65, 96, 102, 0.7), rgba(61, 83, 88, 0.7), rgba(53, 43, 50, 0.7)) fixed;
}