styling of `btn` is overriding specific types

[cflipse]

The styling of btn given in the screen media query is overriding the usual btn-primary btn-danger specializations.

If we're aming to use different colors, we should configure the appropriate bootstrap sass variables. Button colors should not be changing based on screen size.

Should also be careful about a.btn and button.btn differences, as the usual intent is that they both display the same, as actionable buttons