/* 把整站背景换成一张图片，完全铺满无空白 */
body {
    background: url('https://img2024.cnblogs.com/blog/3766900/202605/3766900-20260505191315740-910117439.jpg') no-repeat center center fixed;
    background-size: cover;   /* 改成 cover，上下左右全部填满 */
}

/* 让文章、侧边栏等内容的背景略微半透白，保证文字可读 */
#main, #sidebar, #blogTitle, .post, .entrylist, .newsItem {
    background: rgba(255, 255, 255, 0.85);
    border-radius: 12px;
    padding: 15px;
}