Bulm (https://bulma.io/), kinda similar to bootstrap in using components
Tailwind (https://tailwindcss.com/) if you want to write less custom css classes, but you can end up getting very long class strings as you add properties by adding seperate classes
Responsive website
Hi,
How to make the layout/web page responsive in Umbraco?
I use Bootstrap. I think it's easy to use and it has implemented a lot of accessibility features. https://getbootstrap.com/
There are a lot of options,
As Roger mentioned, bootstrap is 1 option.
Other options:
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