#home{ 
        /*opacity:0.8;//透明度，全透明*/
        background-color:rgba(255,255,255,0.75); //用rgba改个背景透明
}
/*把白背改成透明*/
.sidebar_news, .newsItem, .catListEssay, .catListLink, .catListNoteBook, .catListTag, .catListPostCategory, .catListPostArchive, .catListImageCategory, .catListArticleArchive, .catListView, .catListFeedback, .mySearch, .catListComment, .catListBlogRank, .catList, .catListArticleCategory{
         background-color:rgba(255,255,255,0);  
}

body {      
        background-color: #efefef;     
        background-image: url(https://images.cnblogs.com/cnblogs_com/hhw-/1777320/o_2005310056551002Misaki-Okusawa-Pure-1xhM8A.png);  //换图片
        background-repeat: no-repeat;      
        background-attachment: fixed;      
        background-position: center 0;      
        background-size: cover;   
}