Nested Left Floated Box

Simple enough template to put together. The menu box is nested in the main content div, and floated to whichever side you want, in this case to the left.

#main {
      border: 1px solid #000000; 
      background: #ffffff;
      color: #333333;
      height: 80%;
      }
#nest {
      float: left; 
      width: 240px; 
      border: dashed #666666; 
      border-width: 0 2px 2px 0; 
      background: #c0c0c0;
      color: #333333;
      margin: 0 20px 20px 0;
      }