/* Adjusted from https://stackoverflow.com/a/56401601 */
.click-zoom img {
    transition: transform 0.25s ease;
    cursor: zoom-in;
}
.click-zoom input[type=checkbox]:checked~img {
    position: fixed;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 100%;
    height: auto;
    cursor: zoom-out;
}
.click-zoom input[type=checkbox] {
    display: none;
}