I encountered difficulty when attempting to apply custom styling to a CTA popup form using a CSS file. Unfortunately, it appears that this functionality is lacking. I strongly recommend to the HubSpot development team that this feature be prioritized for implementation as it is greatly needed. Your prompt attention to this matter would be much appreciated.
@Shahid_Mirza got it! yes, I've run into this as well - it's not currently possible for the pop-up CTA to add custom CSS. Definitely agree this would be a huge improvement for the new CTAs, especially if a theme can control the CSS.
