CSS中实现左边固定，右边自适应

1. 左边左浮动，右边加个overflow:hidden;

     #lt{ float: left;width:200px; background: #ff0;}

   #rt{ overflow: hidden; background: #f0f;}

2. 左边左浮动，右边加个margin-left;

     #lt{ float: left; width:200px; background: #ff0;}

   #rt{ margin-left: 200px; background: #f0f;}

3. 左边绝对定位，右边加个margin-left;

     #lt{ position: absolute; top:0; left:0; width:200px; background: #ff0;}

   #rt{ margin-left: 200px; background: #f0f;}

4. 左右两边绝对定位，右边加个width,top,left,right

      #lt{ position: absolute; top:0 ; left:0 ;width:200px; background: #ff0;}

   #rt{ position: absolute; top:0 ; left:200px; width: 100% ; rigth:0;background: #f0f;}