:root,
:host {
    --van-overlay-z-index: 1;
    --van-overlay-background: rgba(0, 0, 0, .7)
}

.van-overlay {
    position: fixed;
    top: 0;
    left: 0;
    z-index: var(--van-overlay-z-index);
    width: 100%;
    height: 100%;
    background: var(--van-overlay-background)
}