.close {
    font-size: 1.5rem;
}

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

.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);
}