#ba4x4 {position:absolute; left:100px; top:25px; width:200px; height:200px; z-index:3}

#bc2x2 {position:absolute; left:100px; top:225px; width:100px; height:100px; z-index:3}

#cc2x2 {position:absolute; left:200px; top:225px; width:100px; height:100px; z-index:3}

#da8x_ {position:absolute; left:300px; top:25px; width:400px; z-index:3}