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<!DOCTYPE html>
<!-- Any copyright is dedicated to the Public Domain.
<html>
<style>
div#details {
background-color: orange;
width: 500px;
height: 300px;
}
div#summary {
background-color: green;
width: 50%;
height: 40%;
}
div#inner {
background-color: cyan;
width: 50%;
height: 60%;
}
</style>
<body>
<div id="details">
<div id="summary">Summary: 40% height</div>
<div id="inner">Div: 60% height</div>
</div>
</body>
</html>