GF front-end styling

I tried a dozen of plugins / addons and even a few premium ones. But honestly they suck…

How come GF doesn’t have a clean front end styling? The Back-end from builder looks way cleaner and modern. How can I apply that style to the front-end?

There are some plugins but the forms usually take on the theme style (to a point). I like to use simply css rather than a plug-in.

Happy to take a look if you can post a URL and a description of what you are after.