CSS may use some refactoring

Problem/Motivation

There are too many "!important" and bad selectors that ignore CSS specificity and rules placement, making it very hard to style.
Also it could be a good idea to remove the custom font (to be ported in the theme of the Seed project) since it's very redundant when this module is used as standalone.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes