There are quite a few websites out there that will offer what you're looking for so that you can embed this into your site. You can use one of the suggestions from these Google Search results and then use these steps outlined here: Adding HTML.
Please keep in mind that while the code may work now, we cannot guarantee that it will continue to work in the future. Codes can become obsolete and/or conflict with the enhancements made to provide you with the best Sitebuilder possible.