Manage banner slideshow color in Brine

Hello.

Since yesterday, a black background has appeared to me at the slideshow banner. So, when I load the page, a large black rectangle appears, in which the first image of the slideshow does fade. When I created the page and for the following days I never noticed this black rectangle. Only yesterday I noticed it. 
How can I manage the background color of the slideshow?

No one can help me in this?

Try something like

.tweak-index-gallery-layout-slideshow .Index-gallery-wrapper {
	background-color: #fff !important;
}

Thank you very very much, Colin!
It worked great! 

 

Excellent news!