Sometimes buttons and inputs aren't supposed to look like buttons, sometimes things that aren't buttons (e.g. links) are supposed to look like buttons.

Bootstrap uses the .btn class for this purpose.

Moodle should adopt this too, and remove the workarounds for applying these button styles to the current mix of classnames and button types.

Current styles are in:

theme/bootstrap/less/moodle/buttons.less

and

theme/bootstrap/less/moodle/expendable.less

(the reason for the latter is that it took a lot of CSS to do this and, before a bug-fix that took care of that, we were sending CSS to IE9 and earlier that was too long for it to cope with.