.sf_blog_outer_wrapper {
    margin: 0 auto;
    width: 100%;
    background-repeat: no-repeat;
    background-position: center top;
    background-image: url(images/image1.jpg);
 }

 .sf_blog_extra9 {
    height: 183px;
    width: 100%;
    clear: both;
    background-position: center bottom;
    background-repeat: no-repeat;
    background-image: url(images/image2.jpg);
 }