一张图学懂css+div 浮动分块

直接看代码和效果图：

代码片段：

<table style="margin:auto;width:900px;height:430px">
<tr>
<td>
<div id="bigBox" style="margin:auto;width:890px;height:430px">
<div id="top_left" style="background-color:blue; float:left; width:340px;height:165px">
Email
</div>
<div id="top_right" style="background-color:red; float:right; width:525px;height:340px;margin-left:16px">
Liuyanban
</div>
<div id="middle" style="float:left;width:340px;height:153px;margin-top:20px">
<div id="middle_left" style="background-color:purple; float:left; width:162px;height:153px;">
QQ
</div>
<div id="middle_middle" style="background-color:green; float:right; width:162px;height:153px;">
login
</div>
</div>
<div id="buttom_left" style="background-color:orange; float:left; width:340px;height:65px;margin-top:16px">
share
</div>
<div id="buttom_right" style="background-color:darkblue; float:right; width:525px;height:65px;margin-top:16px;margin-left:16px">
friengLink
</div>
</div>
</td>
</tr>
</table>

效果图：