Custom CSS help

Is anyone able to help with the custom css required to add title text and a play button over the images for the 4 video boxes on the homepage below?

I had this working on a previous plug-in …but can’t find where to code it on this one…as the CSS for each box appears to be the same.

I’ve added a Photoshop image with the copy and button for now …but need text on there for SEO and to make it easier to update.

Thanks.

The page I need help with: [log in to see the link]