Background_resize

HTML

<div id="rowone">
        <div id="rowonewrapper">
            <div id="rowoneone"></div>
            <div id="rowonetwo"></div>
        </div>
    </div>

CSS

#rowoneone {
    width: 50%;
    height: 120px;
    background-color: green;
    float: left;
}

#rowonetwo {
    width: 50%;
    height: 120px;
    background-color: blue;
    float: right;
    position: relative;
    left: 10px;
}

html, body
{
    height: 100%;
    padding-left: 20px;
    padding-right: 20px;
    padding-top: 20px;
    padding-bottom: 20px;
}


#rowonewrapper {
    margin-right: 10px;
}