<!DOCTYPE html>
<html>
<head>
<style>
body {
    margin: 0px;
    padding: 8px;
}
div { outline: 1px solid green; }
</style>
</head>
<body>
<div style="margin: 10px; padding: 10px; width: 100px; height: 100px;">
    <div style="float: left; width: 20px; height: 10px;"></div>
    <div style="float: left; width: 70px; height: 10px;"></div>
    <div style="float: left; width: 30px; height: 10px;"></div>
</div>
</div>
</body>
</html>