How to change button class?

Site URL: https://www.fleettitle.com/

I need to integrate a site with a third party app called Qualia. I embedded the required code into the footer but then cant seem to change the buttons on my site to correspond to the app. See screenshot attached. How do I do this???

You can add a Code Block >> Paste above code >> then let me know. We can give the code to make above link become to button style.