Ah, the infamous Webflow column padding… I’ve never needed to remove their padding. I read here that this was bugging some, but design-wise I have no opinion on it. I tend to use divs and display:inline-block more and the columns widget less.
What’s funny is that Webflow made me learn the pieces of CSS I didn’t know really… like inline block, where I was struggling with floats (die in hell, float!), and other stuff. By sticking with real CSS properties and vocabulary, WF makes you learn CSS for real.