/* Dark theme */
    body.dark {
        background: url("../assets/bg.jpg");
        background-size: cover;
        color: #f5f5f5;
    }

    .toggle-btn {
        margin: 20px;
        padding: 10px 20px;
        cursor: pointer;
        border: none;
        border-radius: 5px;
        background: #0078d7;
        color: white;
    }