"Cool Button" Demo
This "cool button" is custom coded with HTML and CSS. You can insert it into your website by inserting an HTML block where you want the button to show up, and inserting the CSS code in your site style settings.
You do NOT need to know anything about coding to use it. I will give you the exact code and all you have to do is change the colors, the button text, and the link (which I'll show you how to do).
I have confirmed that this button works on WordPress.org, Leadpages, Showit, and Squarespace. I suspect that it would work on other platforms, but I cannot guarantee it.