Stripe Form Theme Tweaks

I just need help changing the heading text color and background on the payment windows of Stripe in wordpress. Currently using the no-code version, I have had help editing other parts of the Stripe payment window but the color of these text titles and background has been more difficult to change... (Budget: $10 - $30 CAD, Jobs: CSS, Frontend Development, HTML, PHP, User Interface / IA, Web Design, Web Development, Website Design, Website Development, WordPress)