@animationDuration: 0.3s;
.imitate-mask {
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background-color:  rgba(0, 0, 0, 0.5);
    &.imitate-maskanimationIn {
        animation-name: animation-modal-mask;
        animation-duration: @animationDuration;
        animation-direction: normal;
    }
    &.imitate-maskanimationOut {
        animation-name: animation-modal-mask;
        animation-duration: @animationDuration;
        animation-direction: reverse;
    }
}


@keyframes animation-modal-mask {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}