body {
            font-family: Arial, sans-serif;
            display: flex;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            height: 100vh;
            background-color: #3B3D3B;
            margin: 0;
        }
        .gallery {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 40px 60px 40px 60px;
        }
        .thumbnail {
            position: relative;
            width: 150px;
            height: 150px;
            overflow: hidden;
            cursor: pointer;
        }
        .thumbnail img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }
        .modal {
            display: none;
            position: fixed;
            z-index: 1;
            left: 0;
            top: 0;
            width: 100%;
            height: 100%;
            overflow: auto;
            background-color: rgba(0,0,0,0.9);
            justify-content: center;
            align-items: center;
        }
        .modal-content {
            position: relative;
            margin: auto;
            max-width: 80%;
            text-align: center;
        }
        .modal-content img {
            width: 100%;
            height: auto;
        }
        .close {
            position: absolute;
            top: 15px;
            right: 35px;
            color: #f1f1f1;
            font-size: 40px;
            font-weight: bold;
            transition: 0.3s;
            cursor: pointer;
        }
        .close:hover,
        .close:focus {
            color: #bbb;
            text-decoration: none;
        }
        .prev, .next {
            cursor: pointer;
            position: absolute;
            top: 50%;
            width: auto;
            padding: 16px;
            margin-top: -22px;
            color: white;
            font-weight: bold;
            font-size: 20px;
            transition: 0.6s ease;
            user-select: none;
        }
        .prev {
            left: 0;
            border-radius: 0 3px 3px 0;
        }
        .next {
            right: 0;
            border-radius: 3px 0 0 3px;
        }
        .prev:hover, .next:hover {
            background-color: rgba(0,0,0,0.8);
        }
        .caption {
            color: #ccc;
            padding: 10px 0;
        }
        .back-button {
            padding: 10px 20px;
            font-size: 18px;
            cursor: pointer;
            background-color: #007BFF;
            color: white;
            border: none;
            border-radius: 5px;
            margin-top: 20px;
            width: 200px;
        }
        .back-button:hover {
            background-color: #0056b3;
        }