Background image repeat

Great plug-in!

I am working on a staging site and am wondering how I can remove the background repeat on the buttons. I am also wondering how I can give a specific height to the buttons. I don’t want them to resize them selves to the images. So far I have it on two pages:
https://cmastaging.com/salads/ and https://cmastaging.com/cold-subs/

On the salads page I would like the two buttons to center on the image and not go to the top of the image.

I know css, but haven’t figured it out in php file.