/* Mountain background, dimmer on top */
.bg {    
    position: fixed;
    inset: 0;
    z-index: -1;

    background-image:
        linear-gradient(rgba(255,255,255,0.8), rgba(255,255,255,0.8)),
        url('mountain-range.svg');
    background-repeat: no-repeat, no-repeat;
    background-position: 0 -5em, 0 -5em;
    background-size: contain, contain;
}