text: <!DOCTYPE html>
  <html>
  <head>
  <style type="text/css">
  #parent {
   max-height: 100px;
   margin-bottom: 20px;
   background-color: lightgreen;
  }
  #last-child {
   height: 100px;
   margin-bottom: 20px;
   background-color: green;
  }
  #separator {
   height: 20px;
   background-color: blue;
  }
  </style>
  </head>
  <body>
  <div id="parent">
   <div id="last-child"></div>
  </div>
  <div id="separator"></div>
  </body>
  </html>
  