<!DOCTYPE html>
<html>
    <head>
        <meta charset="utf-8">
        <title>Success</title>
        <style type="text/css">
            .core-content-msgbox { font-family: Arial, Helvetica, sans-serif; font-size: 12px; margin: 20px; }
            .core-content-msgbox h3 { font-family: Arial, Helvetica, sans-serif; font-size: 12px; margin: 0 0 10px 0; text-align: center; }
            .core-content-msgbox p { margin: 15px 0 0 0; text-align: justify; }
            .core-content-msgbox .buttons { text-align: center; }
            #continue { height: 25px; font-size: 12px; margin-left: 5px; }
        </style>
    </head>
    <body>
        <div class="core-content-msgbox">
            <h3>Content is installed successfully.</h3>
            <p class="buttons"><button id="continue">Continue</button></p>
        </div>
    </body>
</html>