> you can rarely do a complete overhaul of a website’s design using only CSS Full design yes, but branding/theming is much easier if you use an external stylin

> you can rarely do a complete overhaul of a website’s design using only CSS Full design yes, but branding/theming is much easier if you use an external styling framework like Bootstrap 4 or Foundation and use their component and utility classnames. We have a 300+ page app and tried the one stylesheet per component thing with theme and layout all combined in the past, and was a huge mistake. Banning most custom CSS in place of using the Bootstrap component and util classes has been so much easier.