.fs-popup-background {
    background: rgba(0,0,0,0.8) !important;
    width: 100% !important;
    height: 100% !important;
    position: fixed !important;
    top: 0 !important;
    left: 0 !important;
    z-index: 100000000000000 !important;
    overflow-y: scroll !important;
    -webkit-overflow-scrolling: touch !important;
    color-scheme: auto;
}