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<!DOCTYPE html>
<html>
<head>
<style>
#good {
background-color: green;
}
.abs {
position: fixed;
margin: 0;
padding: 0;
top: 25px;
left: 25px;
width: 50px;
height: 50px;
background-color: green;
}
</style>
</head>
<body>
The green square should completely cover the red square.
<div class="abs" id="good"></div>
</body>
</html>