.background {
    position: relative;
    z-index: 1
}

.background:before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    right: 0;
    bottom: 0;
    background-image: var(--background);
    background-size: cover;
    background-repeat: no-repeat;
    background-position: 50% 50%;
    opacity: 0.2;
    z-index: -1
}

.background[data-dark="false"] {
    background: #f5f5f5;
    color: #000
}

.background[data-dark="true"] {
    background: #212121;
    color: #fff
}