body {
    margin: 0;
    padding: 0;
    width: 100%;
}

#mobile, #desktop {
    width:100%;
    height: 100%;
}

#mobile video, #desktop video {
    width:100%;
    height: 100%;
    object-fit: cover;
}

#mobile {
    display: none;
}
    
#desktop {
    display: none;
}

@media (max-aspect-ratio: 4/3) {
    
    #mobile {
        display: block;
    }
    
}

@media (min-aspect-ratio: 4/3) {
    
    #desktop {
        display: block;
    }
    
}