body {
    background: rgba(100, 100, 129, 100) url('https://images.cnblogs.com/cnblogs_com/Annoming/1856555/o_200929075854hello.jpg') fixed no-repeat;
    background-position: 50% 5%;
    background-size: cover;
   font-size:14px;
     padding-top:360px;
       margin:0;
  
}
#home {
    margin: 10 auto;
    width: 66%;/*原始65*/
    min-Width: 500px;/*页面顶部的宽度*/
    opacity:0.5;
    padding: 25px;
    margin-top: 50px;
    margin-bottom: 50px;
   
}

#blogTitle {
    height: 10px;  /*高度*/
    padding-bottom: 50px;
    clear: both;
}


#back-to-top {
    background-color:black;
    bottom: 0;
    box-shadow: 0 0 6px ;
    color: #444444;
    padding: 2px 2px;
    position: fixed;
    right: 20px;
    cursor: pointer;
    madding-bottom:2px；
}