FAQ Block is a block for Gutenberg. With it, you will be able to create a Frequently Asked Questions page on your website very easily. Simply add a block for each question and you are done.
CSS only!
There is no Javascript, it's fully in CSS. It's very easy to customize it for your theme, and super light.
Known issues
I am not sure if it's currently a bug in Gutenberg: this block requires an input in the generated HTML but for some reason, Gutenberg removes it from the DOM while saving. This issue only happens for author/editors, but not for admins (which is even more weird).