.gallery-img {
    cursor: pointer;
}
.modal-img {
    width: 100%;
}
.modal-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 2rem;
    color: white;
    background: rgba(0, 0, 0, 0.5);
    border: none;
    padding: 1rem;
    cursor: pointer;
    z-index: 100;
}
.prev { left: 1rem; }
.next { right: 1rem; }