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<html>
<head>
<style>
div { width: 100px; }
div.a { height: 30px; background: lightblue; }
div.b { height: 100px; background: lightgreen; }
div.c { height: 10px; background: black; }
</style>
</head>
<body>
<div class="a"></div>
<div class="b"></div>
<div class="c"></div>
</body>
</html>