Put a DIV in the lower right corner of another div with CSS positioning

<div id="box1"> 
<div id="box2">测试内容</div> 
</div> 
<style> 
<!-- 
#box1{width:600px;height:600px;background:green;position:relative} 
#box1 #box2{width:200px;height:200px;background:red;position:absolute;right:0;bottom:0} 
--> 
</style> 

 

Relative positioning of the parent object, absolute positioning of the child object with the parent object as the reference point ;  the outer div is set to relative positioning, and the inner div is set to absolute positioning;