Customizing widgets with page builder

I’ve hit a wall with building out my static front page. I’ve added the “Services” widget, but I can’t get the icons I’ve uploaded to the media library to appear. I included the link to each image in their respective services page, but nothing. I’m using localhost, and wondering if that’s the issue. Also, the background color for the widget is the same as the theme’s primary color, but I’d like to change that and can’t figure out how. The custom CSS I’m entering in Page Builder isn’t taking. Help, please!!!