#vid1 {
    width: 50%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    visibility: hidden;
    object-fit: fill;
}

#vid2 {
    width: 50%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    visibility: hidden;
    object-fit: fill;
}

#vid3 {
    width: 50%;
    height: 100%;
    position: absolute;
    left: 50%;
    top: 0;
    visibility: hidden;
    object-fit: fill;
}

#vid4 {
    width: 50%;
    height: 100%;
    position: absolute;
    left: 50%;
    top: 0;
    visibility: hidden;
    object-fit: fill;
}