@media (max-width: 767px) {
    .visible1 {
        display: none; 
    }
    .visible2
    {
        display: block;
    }
}

/* CSS for larger screens */
@media (min-width: 768px) {
        .visible1 {
            display: block; 
        }
        .visible2
        {
            display: none;
        }
}

@media (max-width: 767px) {
        .carousel-margin {
            margin-top: 3em; 
        }
    }

/* CSS for larger screens */
@media (min-width: 768px) {
        .carousel-margin {
            display: block; 
        }
}