body{
    background-image: url('https://images.cnblogs.com/cnblogs_com/blogs/639921/galleries/2036428/o_210925125707null-42f90cfcea5b93d8.jpg');

}
/*
#blog_post_info_block{
    display:none;
}
#top_nav{
    display:none;
}
#header{
    display:none;
}
#topics {
    background: #ffffff;
    overflow: hidden;
    padding: 20px;
    border: 1px solid #dedede;
}
#navigator{
    display:none;

}
#sideBar {
    flex: 0 0 300px;
    width: 300px;
    margin: 0 20px;
    float: left;
    -o-text-overflow: ellipsis;
    text-overflow: ellipsis;
    overflow: visible;
    word-break: break-all;
    display: none;
}
#main {
    display: flex;
    max-width: 100%;
    margin: 0px auto 0;
    clear: both;
}
#topics {
    background: #ffffff;
    overflow: hidden;
    padding: 64px;
    border: 1px solid #dedede;
}
#mainContent {
    flex: 0 1 100%;
    background: none;
    overflow: visible;
    text-overflow: ellipsis;
    max-width: 100%; 
    word-break: break-all;
}
#comment_form{
    display:none;

}
#footer{
    display:none;
}
*/