.overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.gallery-container {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    width: 800px;
    background-color: #fff;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(0, 0, 0, 0.5);
}

.main-image {
    width: 100%;
    height: auto;
    display: block;
    margin-bottom: 15px;
    border-radius: 5px;
}

.thumbnails {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 10px;
}

.thumbnail {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: border-color 0.3s;
    object-fit: cover;
}

.thumbnail:hover, .thumbnail.active {
    border-color: #4CAF50;
}

.close-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    font-size: 24px;
    color: #555;
    cursor: pointer;
    background: none;
    border: none;
}

.close-btn:hover {
    color: #000;
}

.nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 24px;
    color: white;
    background-color: rgba(0, 0, 0, 0.5);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
}

.nav-btn:hover {
    background-color: rgba(0, 0, 0, 0.8);
}

.prev {
    left: 10px;
}

.next {
    right: 10px;
}