.lightbox {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    background: rgba(0,0,0,0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 99999;
}

.lightbox_img {
    max-width: 90%;
    max-height: 90%;
    border-radius: 10px;
}

.lightbox .close {
    position: absolute;
    top: 20px; right: 40px;
    font-size: 40px;
    color: white;
    cursor: pointer;
}

.lightbox .nav {
    position: absolute;
    top: 50%;
    font-size: 60px;
    color: white;
    cursor: pointer;
    user-select: none;
    padding: 0 15px;
}

.lightbox .prev { left: 30px; }
.lightbox .next { right: 30px; }