.content-bg-repeat {
    float: left;
    width: 960px;
}

.content-bg-single {
    float: left;
    width: 960px;
    background: transparent url('../images/background-content-single.png') no-repeat top left;
}

.content-full {
    float: left;
    width: 960px;
}

.content-full-margin {
    margin: 20px 0px;
}