You can edit / change the code and click run button <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <style> .myclass { text-align: center; color: green; } </style> <script>var clicky_site_ids = clicky_site_ids || []; clicky_site_ids.push(101319977);</script><script async src="//static.getclicky.com/js"></script> <h2> I am heading 2</h2> <h3>I am heading 3</h3> <p>I am a Paragraph</p>