.galleria .col-12 img {
    opacity: 0.7;
    cursor: pointer;
    /*margin: 2rem;*/
    /*width: 100%;*/
}

.galleria    .col-12 img:hover {
        opacity: 1;
        box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
    }