body {
color: #000;
background: url(https://images.cnblogs.com/cnblogs_com/wyz0918/1301926/o_Unsplash%20Source_540460075.jpg
) fixed;
background-size: 100%;
background-repeat: no-repeat;
font-family: "Helvetica Neue",Helvetica,Verdana,Arial,sans-serif;
font-size: 12px;
min-height: 101%;
}

<style type="text/css">


  #home {
    margin: 0 auto;
    width: 72%;/*原始65*/
    min-width: 980px;/*页面的最低宽度,也就是页面顶部的宽度*/
    background-color: #fff;
    padding: 30px;
    margin-top: 50px;
    margin-bottom: 50px;
    box-shadow: 0 2px 6px rgba(100, 100, 100, 0.3);
   }
  /*博客标题*/
#blogTitle {
    height: 60px;  /*高度*/
    clear: both;
}
    /*主标题格式*/
    #blogTitle h1 {

        font-size: 26px;
        font-weight: bold;
        line-height: 1.8em;/*原始 1.6em*/
        margin-top: 10px;/*原始 15px */

    }

        #blogTitle h1 a {
            color: #e0ecf9;
        }
            /*超链接颜色*/
            #blogTitle h1 a:hover {
                color: #f3f9ff;
            }
    /*次标题格式*/
    #blogTitle h2 {
        font-weight: normal;
        font-size: 17px;/*原始 16px ；font-size: 1.0rem;*/      
        line-height: 1.8;
        color: #757575;
        float: left;        
    }
    #cnblogs_post_body
    {
        color: black;      
        font: 0.875em/0 em "微软雅黑" , "PTSans" , "Arial" ,sans-serif;
        font-size: 16px;
        vertical-align: middle

    }
#cnblogs_post_body img {
    margin: 0 auto;
    max-width: 300px;
    max-height: 300px;
    text-align: center;
    display: block;
}



    #cnblogs_post_body h1    {
     
    background: #3586c2;
    border-radius: 6px 6px 6px 6px;
    box-shadow: 0 0 0 0px #000000, 1px 0px 6px 1px rgba(10, 10, 0, 0.3);
    color: #FFFFFF;
    font-family: "微软雅黑" , "宋体" , "黑体" ,Arial;
    font-size: 19px;
    font-weight: bold;
    height: auto;
    line-height: 28px;
    padding: 10px 0 10px 8px;
    text-shadow: 1px 1px 1px #222222;
    text-indent: 4px;
    margin: 18px 0 !important;
    }
 #cnblogs_post_body h2{
        background: #5aa1b9;
        border-radius: 6px 6px 6px 6px;
    box-shadow: 0 0 0 0px #000000, 1px 0px 6px 1px rgba(10, 10, 0, 0.3);
        color: #FFFFFF;
        font-family: "微软雅黑" , "宋体" , "黑体" ,Arial;
        font-size: 16px;
        font-weight: bold;
        height: auto;
        line-height: 25px;
        margin: 12px 0 !important;
        padding: 5px 0 8px 20px;
        text-shadow: 1px 1px 3px #222222;
    }

     #cnblogs_post_body h4{
        display: inline;
        font-family: "微软雅黑" , "宋体" , "黑体" ,Arial;
        font-size: 16px;

        font-weight: bold;
        color: #c81623;
        
    }
#mainContent{
margin: 0 auto;
width: 780px;
float: none;
}
#topics .postTitle{
    padding: 10px
}
.postBody {
    padding: 15px 2px 5px 5px;
   
}


</style>