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html 5 marign top right bottom left

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
    <title>Document</title>
    <style>

        #container{
            width:1000px;
            height: 1000px;
            background: yellow;
        }
        
        div{

            width:490px;
            height:490px;
            background: blue;
            float:left;
            margin: 5px;
        }

    </style>
</head>
<body>
    <div id="container">
        <div></div>
        <div></div>
        <div></div>
        <div></div>
    </div>
</body>
</html>