Suggested changes from Shamsi

[bbarker]

Re: labordynamicsinstitute/metajelo-ui-css-classes#2

• > One note: I wanted to target "delete" buttons vs. "add" buttons. If each type of button had a class (like "button-delete" or "button-add") we could differentiate more clearly between these very different types of user actions.

• > And one last thought: if more semantic html elements are used in the future we'll probably want to transpose these styles, and should be able to simplify some of it.