Library Items - Formatting

[marycklein]

Need a little vertical space between author and preview text or body text, whichever comes next.

Example of too-tightness:

Here is a library item that I "built" within Wagtail and to which I manually added some vertical space below author byline:

I would love it if we could "bulk apply" that spacing to "all" library items, and then if I need to go back and delete some of the spaces that I inserted manually, I could do that.