@media screen and (max-width: 767px) {
    body.xoo-wsc-cart-active,
    body.wpc-overlay-visible,
    body.dialog-prevent-scroll {
        overflow: hidden !important;
        position: fixed !important;
        left: 0 !important; 
        top: 0 !important; 
        right: 0 !important; 
        bottom: 0 !important;
    }
}