I use Thrive Architect for Wordpress. They incorporate Sliders to size all their elements. I don't have a web design background, but I find the Sliders in Thrive Architect to be a tremendous help for determining length and width of any element I use to build my site. Instead of guessing with pixels, I just use the sliders to size my elements easily visually. These work for sections, font, containers, images, and etc. I think it is a phenomenal asset for beginner to intermediate users. Webflow should incorporate these Sliders to improve Webflow's ease of use and to raise confidence for people who are less technical using specific units.