Styling the Slider

I’m replicating a site in WordPress (previously just straight code) and I want to have the captions in the slider more prominent – you can see what I’m after on the original site at https://entrustmt.com/ – basically having more CSS control over the font, and being able to have 2 lines with a break and different weights. In the original site, it was easy with ‘strong’ and ‘span’ tags.