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css - how to remove white border around the div

I am trying to develop a web site from scratch. Here is the code

<html>
<head>
</head>
<body >
<div id="top" style="height:200px;background-color:green">
</div>
<div id="middle" style="height:800px;background-color:white">
</div>
<div id="footer" style="height:200px;background-color:green">
</div>

</body>
</html>

Problem is that there is a white space around above div tags. I can remove white space using margin: -10px; property. But I don't like to handle it that way. Is there way to handle this in decent way in css?

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