Actually it really depends on your needs, there are 3 types of UI frameworks you can use:
-
A complete set of UI components like: https://react-bulma.dev/en/getting-started.
Pros:
Having a lot of pre-built UI components saves a lot of time
Cons:
need to learn the react framework and the bulma styles, and it's harder to customize to your needs
-
A pure css framework, like Bulma, where you write all the components yourself.
Pros:
A lot of flexibility to build the components you need
Cons:
You are bound to Bulma classes and markup.
Takes more time since you need to build the components
A utility class framework like: https://tailwindcss.com/.
Pros:
Most flexible, mix and match classes as you like and build your own markup
Very easy to customize to your needs
Cons:
Might take time to get used to and takes more time since you need to build the components
If you choose options one, then it's just a matter of deciding what style you like (material,ant, bulma) and go with the library that implements it If you go with pure css and build your own components, I can't recommend tailwind enough, I've been finding myself building entire pages without writing a single line of css.
And if later on, the designer wants to make a change to some color, or size, I just need to change one value in the config file, and the entire app is updated.