<!DOCTYPE html>
<html>
<head>
  <style>
    div.outer {
      width: 300px;
      height: 100px;
      background-color: green;
    }
    div.inner {
      position: relative;
      left: 75px;
      top: 25px;
      width: 150px;
      height: 50px;
      background-color: lime;
    }
  </style>
</head>
<body>
  <div class="outer">
    <div class="inner"></div>
  </div>
</body>
</html>