body{

    background-image: url('https://img2024.cnblogs.com/blog/1526664/202501/1526664-20250113172352579-485394647.jpg'); /* 替换为你的图片路径 */

    /* background-repeat: no-repeat; 背景图片不重复 */
}
.day{
    border: 1px dotted #8a8a8a;
    background-color: #fff;
    background: rgba(255, 255, 255, 0.5); /* 50%透明的白色背景 */
    background-image: url('');
    background-repeat: no-repeat;
    background-position: right top;
    padding: 20px;
    color: #4b4b4b;
    margin-bottom: 20px;
    margin-left: 2px;
}