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<!doctype html>
<meta charset="utf-8">
<style>
#button {
width: 400px;
height: 400px;
margin: 100px;
padding: 0;
border: 0;
background-color: purple;
vertical-align: top;
}
#button > div {
width: 100px;
height: 100px;
background-color: green;
}
</style>
<button id="button">
<div></div>
</button>