How to apply theme styles to HubSpot CTA (legacy) buttons
You can use the included Button module for most of your page buttons. Still, in those particular cases where you may need to add a button in a Rich Text field or if you want to apply theme styles to HubSpot CTA (legacy) buttons, there are classes and code snippets listed in the Button classes guide.
The classes are listed in the first code box next to each button. Please watch the video below for a quick guide.
Open the detailed classes and snippets here: Button classes → How to apply theme styles to HubSpot legacy CTAs