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<!DOCTYPE html>
<html>
<style>
#header {
position: fixed;
top: 0;
left: 9px;
}
#header > div {
border-radius: 10px;
overflow:hidden;
height: 100px;
width: 100px;
}
#inner {
width: 200px;
height: 200px;
background-color:green;
}
</style>
<div id="section">
<div id="header">
<div>
<div id="inner"></div>
</div>
</div>
</div>
</html>