relativní margin

<html>
  <head>
  <title></title>
  <style type="text/css">
  <!--
   .c1 {
      height: 200px;
      width: 700px;
      background-color: blue;
   }
    .d1 {
      height: 98.00%;
      width: 98.00%;
      margin-left: 1.00%;
      margin-right: 1.00%;
      margin-top: 1.00%;
      margin-bottom: 1.00%;
      background-color: red;
   }
  //-->
  </style>
  </head>
  <body>

  <div class="c1">
    <div class="d1">
    </div>
  </div>

  </body>
</html>