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<!DOCTYPE html>
<html>
<head>
<style>
#overlay {
width: 200px;
height: 150px;
background: green;
opacity: 0.5;
pointer-events: none;
}
button {
position: relative;
top: 10px;
width: 150px;
height: 50px;
border: solid black 2px;
box-sizing: border-box;
font: Helvetica bold;
font-size: 18px;
text-align: center;
background: black;
color: white;
}
</style>
</head>
<body>
<button id=button>Click me!</button>
<div id=overlay></div>
<script>
document.getElementById('button').addEventListener('click', function() { alert("Ouch!"); });
</script>
</body>
</html>
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