#greta {
    background-color: unset;
    width: calc(0.75 * 1320px);
    height: auto;
    position: relative;
    overflow-x: hidden;
    margin-left: auto;
    margin-right: auto;
}

@media screen and (max-width: 512px) {

    #greta {
        margin-left: calc(-1 * var(--side-padding));
        margin-right: 0;
        width: calc(100% + 2 * var(--side-padding))
    }
}