Describe the bug
Blockquote does nothing.
Steps to Reproduce / Codesandbox Example
Steps to reproduce the behavior:
Expected behavior
When enabling (or having it already in initial content) blockquote I expect text to go little gray and have vertical line in front of it on the left.
Screenshots

Environment
Additional context
Add any other context about the problem here.
As tiptap is a renderless editor component the styling is not part of tiptap, it's up to you.
Here ist the style used in the examples:
https://github.com/ueberdosis/tiptap/blob/5cb2bfeacc604150183b934b44b80bdc392a8da6/examples/assets/sass/editor.scss#L53-L62
Hope this helps.
Most helpful comment
As tiptap is a renderless editor component the styling is not part of tiptap, it's up to you.
Here ist the style used in the examples:
https://github.com/ueberdosis/tiptap/blob/5cb2bfeacc604150183b934b44b80bdc392a8da6/examples/assets/sass/editor.scss#L53-L62
Hope this helps.