body {
            margin: 0;
            padding: 0;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
            font-family: sans-serif;
            text-align: center;
        }
        #loader {
            width: 50px;
            height: 50px;
            border: 5px solid #f3f3f3;
            border-top: 5px solid #3498db;
            border-radius: 50%;
            animation: spin 1s linear infinite;
            margin: 20px;
        }
        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }
        #error {
            color: red;
            margin: 20px;
            padding: 10px;
            display: none;
        }
        img {
            max-width: 100%;
            max-height: 90vh;
        }
        button {
            background-color: #3498db;
            color: white;
            border: none;
            padding: 10px 20px;
            border-radius: 5px;
            margin-top: 20px;
            cursor: pointer;
        }