I can't remove the subheading text/background from the 'Image with text link' section in Venture

[easylime]

easy-lime-replacement.myshopify.com

I'm using the venture theme, and I can't edit the subheading button which just has a black background. I decided to remove it but theres a little black box that remains. I can't find the image with text link section in the custom css Edit: I just removed it entirely and used a slideshow, but if you have an answer that'll be helpful I've read a few others with the same problem