body {
    font-family: Arial, sans-serif;
}

.gallery {
    display: flex;
    justify-content: center;
    margin-top: 50px;
}

.thumbnail {
    width: 150px;
    cursor: pointer;
}

.lightbox {
    display: none;
    position: fixed;
    z-index: 1;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgba(0, 0, 0, 0.8);
}

.lightbox-content {
    margin: auto;
    display: block;
    width: 80%;
    max-width: 700px;
}

.lightbox-title {
    color: #fff;
    text-align: center;
    margin-top: 10px;
    font-size: 20px;
}

.close {
    position: absolute;
    top: 20px;
    right: 35px;
    color: #fff;
    font-size: 40px;
    font-weight: bold;
    cursor: pointer;
}