Changing text background in Leaftheme

I am using https://switcher.leafthemes.com/?product=brown and would like to change the background behind the introductory text next to the book…Lovely – Lollipop pie marzipan etc to white, so the text can easily be read.

It would have been great if the designer of this theme had done this, but am guessing that a programmer is needed if I want to customise it?