I happen to end up creating a lot of static web pages when building simple websites or documentation (for internal and external use) - is there a collection of lightweight CSS resources like this?

For example, some things I would want to be able to select/tweak:

* Colour scheme/theme

* Responsiveness to mobile devices (i.e. changing fonts/layout, etc)

* Navigation bar

* Transition effects

* Support for older browsers (but still look okay (yes this is still a requirement in 2019))

* Support for IE (which seems to be hilariously harder than it should be)

* Toggle/select use of fonts

If not then it might be useful to build out a tool to dynamically create such a thing.