Hello,
I'm really enjoying Confluence Cloud, it's a good product that makes documentation come to life.
There's a problem with Excerpt. For some reason the text content inside of an Excerpt Macro is shrunk by 12.5%, including when the page is displayed (not in Editing mode).
This is very annoying an unnecessary. The point of the macro is simply to include content from one page onto another. Not to format things strangely, that make it look less uniform.
It's caused by a single css attribute, that set's the font size to 0.875rem for no reason.

