Author name styling on mobile breakpoints

[RabeaGleissner]

Hi ladies,

I noticed that the author name is squashed on smaller breakpoints.

I thought I'd just open a pull request and fix the styling so that the author name is centred, just like social share buttons. But unfortunately I'm having trouble installing the gems on my machine!
Here's a screenshot:

Anyway, just wanted to let you know about this!

[KimberleyCook]

@RabeaGleissner This is a good small issue to leave for 24 Pull Requests I think, thanks for bringing it to our attention.

[RabeaGleissner]

@KimberleyCook Ah yes, great idea!