This causes an issue where the <li> elements shift by 1px
because of the font-weight adjustment. We could probably fix
this by introducing box-sizing: border-box, but we'll add
that in globally later, hopefully. For now, no more bolded text.
The blue hover for menu-items has been replaced by #eee (very light
grey). The blue seemed arbitrary, and didn't match with the rest of
Pure.
* `-core.css`: The module's most basic functionality.
* `[module].css`: The module's main rules, assumes `-core.css` rules.
* `-context.css`: A contextualized version of `[module].css`.
* `-r.css`: Respnsive, `@media` query rules.
* `-[feature].css`: Optional feature that provides extra rules.
