.sf_outer_wrapper {
    background-position: 50% 0;
    background-repeat: no-repeat;
    width: 960px;
    margin: 0 auto;
    background-image: url(images/ColonialFlag.jpg);
 }

 .sf_extra5 {
    background-position: 50% 0;
    background-repeat: no-repeat;
    height: 219px;
    width: 100%;
    background-image: url(images/BostonTeaParty2.jpg);
 }