<html>
<head>
<style>
ul {
  padding: 0px;
  margin: 0px;
}

li {
  margin: 0px;
  padding: 0px;
  float: left;
  width: 100px;
  height: 100px;
  display: block;
}

li.li1 {
  position: relative;
  left: 100px;
  background-color:green;
}

li.li2 {
   background-color:red;
}
</style>
</head>
<body>
<p>You should see a single 100x100 green block below.  If you see any red, the test has failed.</p>

<ul>
<li class="li1"></li>
<li class="li2"></li>
</ul>
</html>