I just found a solution by using the same code in the CSS options of the bbp Style Pack plugin. Thanks!
I tried this but it did not work.
I’m using the bbPress Toolbox plugin and and I did activate bbc code as the method to use quotes so all that happens is a < blockquote > tag added.
I’ve added your suggestion to the css file, which I put in my child theme folder (themes/childtheme/bbpress/bbpress.css).
No difference though, bbpress still uses the CSS from my style.css.
