#video-bg {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 100vh;
    z-index: -1;
}

#video-bg video {
    position: absolute;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

@media screen and (max-width: 670px) {
    #video-bg video {
        top: 0;
        height: 100vh;
        width: unset;
        left: 50%;
        transform: translateX(-50%);
    }
}