#banner,
#banner-responsive {
    width: 100%;
    height: auto;
}

#banner img,
#banner-responsive img{
    width: 100%;
    height: auto;
    z-index: 1;
}

#banner-responsive {
    display: none;
}

@media (max-width: 450px) {
    
    #banner {
        display: none;
    }
    
    #banner-responsive {
        display: block;
    }
}