How to change the background color from transparent to White?

Support ForumCategory: Testimonial CarouselHow to change the background color from transparent to White?
Joan asked 3 years ago

I did not realize these only looked good with a white page background.  My page background in blue… and most Styles do not render well.  
The best one for me is Style 3.   But since the Styles background is transparent, my blue background shows with only a spot of white at the base.   How do I make the background white so the Testimonial Quotes look like conversation bubbles as intended?