button css: lock down specific styles for both anchors and button elements
button css: lock down specific styles for both anchors and button elements

Because `button.romo-btn` wasn't in the rule, styles were getting
incorrectly overridden in some cases.  This caused romo-btn styles
to work on anchor elems but break on button elems.

This essentially forces button and anchor elems to have matching
rule weights.

redding/romo,redding/romo,redding/romo