bbPress.org

Your theme had something similar to this CSS

.single_post a {
  font-size: 14px ;
  margin-left: 0 ;
}

So the new CSS I gave you would overwrite it only on bbPress forums.

you can add it

to your child themes style.css

in a custom css plugin

and you could add it to the bbpress.css file if you put it in your child theme in a folder called css somewhere above the media queries or just at the top above the other css rules.