.video-about {
    position: fixed;
    top: 0;
    left: 0;
    user-select: none;
    width: 100%;
    height: 100%;
    z-index: 999999999999999999999999;
    background-color: #000000a1;
    opacity: 0;
    pointer-events: none;
    transition: all linear .2s;
}

.video-about.show {
    opacity: 1;
    pointer-events: all;
}

.video-about iframe {
    width: 640px;
    height: 360px;
}