ui-mask {
    contain: size style layout;
    background: inherit;
}

.ui-mask {
    z-index: $mask-z-index;
    position: fixed;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    background-color: $mask-background-color;
    transition: opacity .3s $cubic-bezier;
    opacity: 0;
    pointer-events: none;
    &.ui-show {
        opacity: 1;
        pointer-events: auto;
    }
}