Hmm... Making a site work on mobile in webflow should not take that long. We are talking hours, not days like before.
But what I think you actually wants is a guide in best practise of css styling.
- Use max width and not width. That makes the elements shrink automatically.
- Use a wrapper of all elements to control the padding going from screen to mobile.
- Use % based where you can
- Use the same class name on as many elements as possible. So when you change one, everyone change.
Often, all I have to do going from screen to mobile is to make the menu and sometimes change the footer if it contains a lot of information.
A few changes and the site should be good on mobile.