<html>
<head>
    <link rel="stylesheet" href="../resources/default.css">
</head>
<body style="height:2000px;">
    <!-- You should see 2 rectangles touching on one corner in the output: a green one (top left) and a green one. -->
    <div id="container" style="top: 200px; opacity: 0.4" class="relative blue"><div style="top:100px; left:100px;" class="absolute green"></div></div>
</body>
</html>