[ticket/12562] Add max-width to proSilver

PHPBB3-12562
[ticket/12562] Increase mq trigger screen size to hide border

PHPBB3-12562
[ticket/12562] Use Hanakin's version

PHPBB3-12562
[ticket/12562] Use border for all sizes except responsive

PHPBB3-12562
Merge branch 'ticket/12562' of https://github.com/PayBas/phpbb into develop-ascraeus

* 'ticket/12562' of https://github.com/PayBas/phpbb:
  [ticket/12562] Use border for all sizes except responsive
  [ticket/12562] Use Hanakin's version
  [ticket/12562] Increase mq trigger screen size to hide border
  [ticket/12562] Add max-width to proSilver