day14 python css position relative absolute

<div style="width: 500px;height: 400px;border: 1px solid red;position: relative">

         <div style="height: 200px">

             <!-- 这个absolute只认识relateve，别的都不认识-->

         <div style="position: absolute;bottom: 0;right: 0">aaa</div>

         </div>

     </div>