|}
|}
<div style="float:left;display:block;width:50%;">
<div style="float:left;width:50% ;height:100px;background-color:blue;">1</div>
<div style="float:left;width:50% ;height:100px;background-color:red;">2</div>
</div>
<div style="float:left;display:block;width:50%;">
<div style="float:left;width:50% ;height:100px;background-color:green;">3</div>
<div style="float:left;width:50% ;height:100px;background-color:yellow;">4</div>
</div>