.gallery img { 
    cursor: pointer; 
}

.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: 9999;
    cursor: pointer;
}

.lightbox img {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: auto;
    max-width: 80vw;
    max-height: 80vh;
    width: auto;
    height: auto;
}