body {
    background-image: url('https://file.moyublog.com/free_wallpapers_files/dmm5ph3tkv0.jpg'); /* 替换为您的图片URL */
    background-color: #f5f5f5; /* 备用背景颜色 */
    background-size: cover;
    background-attachment: fixed;
    font-family: 'Arial', sans-serif;
    color: #333;
}