.gallery {
    display: flex;
    flex-wrap: wrap;
}

.gallery-item {
    flex: 1 0 25%;
    cursor: pointer;
    transition: opacity 0.3s ease-in-out;
}

.gallery-item:hover {
    opacity: 0.7;
}

.gallery-item img {
    width: 100%;
    height: auto;
}

.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    justify-content: center;
    align-items: center;
    transition: opacity 0.3s ease-in-out;
    z-index: 1000; 
}

.lightbox-content {
    max-width: 90%;
    max-height: 90%;
}

.close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 30px;
    color: #fff;
    cursor: pointer;
}

.nav-btn {
    position: absolute;
    top: 50%;
    font-size: 3.5em;
    color: #fff;
    background: none;
    border: none;
    cursor: pointer;
    outline: none;
    transition: opacity 0.3s ease-in-out;
}

.nav-btn:hover {
    opacity: 0.7;
}

.nav-btn.left {
    left: 15px;
}

.nav-btn.right {
    right: 15px;
}