Adding style to single columns

I am trying to add a background to the three columns in the services section on this site https://www.incrementalbusiness.com but WordPress is pulling the columns so that I can’t edit each column by themselves and it changes all the columns with the same class in the entire site via the stylesheet.

I can do what I want via in-line styling in my browsers developer tools, but I cannot figure out how to add in-line styling in wordpress.