At most use the Bootstrap grid system. Roll your own component styles, particularly if you're trying to sell whatever you're building as a product. Otherwise, y

At most use the Bootstrap grid system. Roll your own component styles, particularly if you're trying to sell whatever you're building as a product. Otherwise, your project will lack identity. I'm more sensitive to it than most because of my background, but if I see an app using Bootstrap defaults, it negatively affects my opinion. That said, the Bootstrap 4 defaults are much more modern looking than Bootstrap 3's.