Created by: kvlsrg
This PR fixes two problems with input groups.
First is hover change of middle (not rounded) border color of input because of input & button borders overlay:
Second one is that now input color is not compatible with dark background:
after this PR:
Sorry if I didn't get why now $input-border-color
has RGBA value. But it will be great to fix this issues without changing z-indexes logic or any other major changes. Thanks!