Transparent Block Behind Slider Text

Version: 3.4.19

I’m trying to support a client using Customizr theme. First trying to get them to purchase pro for support / update purposes.

They would like to have the semi-transparent block behind the text on slider removed. I know I can go in and mess with css, but would appreciate if someone could point me right were I need to make this tweak.

Thank you,
KeywordGuy