<!DOCTYPE html>
    <html>
        <head>
            <style type="text/css">
                * {
                    margin: 0;
                }
                #div0 {
                    position: absolute;
                    height: 100px;
                    width: 100%;
                    background-color: green;
                }
            </style>
        </head>
    <body>
        <div id="div0">
        </div>
    </body>
</html>
