#blogTitle {
                                     position:fixed;
                                     top:0;
                                     left:0;
                                     height: 100%;
                                     width:100%;
                                     z-index:-10;
                             clear: both; 

                                     background-image:url("https://p4.ssl.cdn.btime.com/t01f97e61fc03da09d6.jpg?size=640x544");
                                     background-size:cover；
                                     
}