[ticket/12862] Add Border

PHPBB3-12862
[ticket/12862] Resize popups consistently

PHPBB3-12862
Merge pull request #2783 from hanakin/ticket/12862

[ticket/12862] Fix pop-up boxes wraps

* hanakin/ticket/12862:
  [ticket/12862] Resize popups consistently
  [ticket/12862] Add Border