i don't think we should be this opinionated about form input styling by default. There was a good discussion about this in FED slack earlier today, but by styling form elements directly, if you want to create any variation within the theme for those elements, you'd need to undo all of these styles in that variant.

does timber as a base even need form styles out of the box? Presumably these are overwritten by each theme anyway?

... i still think this is too opinionated as a default? How would these be overwritten if a variant on an input was required? @cshold

This is a step to reduce selector specificity, which I think it accomplishes. It's not perfect, so we'll revisit the reset vs base styles in another PR shortly.