.sf_blog_header_wrapper {
    clear: both;
    position: relative;
    width: 900px;
    height: 100px;
    background-position: left;
    border-top: 6px solid #fff;
    background-repeat: no-repeat;
    background-image: url(images/logoheaderblog.jpg);
 }

 body {
    margin: 0 auto;
    font-family: arial;
    font-size: 12px;
    background-color: #FFFFFF;
 }