<html>
<body>
This is text. <button style="position: relative; height: 100px; width: 100px; -moz-box-sizing: content-box">
<div style="position: absolute; top: 50px; left: 50px; border: 2px solid green; height: 25px; width: 25px"></div>
</button>
</body>
</html>