<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>

    <style  rel="stylesheet" type="text/css">
        div{
            margin: 0 auto;
            background-color: #eb974e;
            width: 300px;
            height: 300px;
        }
    </style>

    <body>
        <div>
            <p>this is a h5 page</p>
        </div>
    </body>
</html>