Fix modal edge spacing
Fix modal edge spacing

No issue

The transparent border surrounding modals was being cut off.
This fix uses padding instead of adjusting the left & right valued to create space.

TryGhost/Ghost-Admin,kevinansfield/Ghost-Admin,airycanon/Ghost-Admin,kevinansfield/Ghost-Admin,airycanon/Ghost-Admin,TryGhost/Ghost-Admin,JohnONolan/Ghost-Admin,dbalders/Ghost-Admin,acburdine/Ghost-Admin,dbalders/Ghost-Admin,acburdine/Ghost-Admin,JohnONolan/Ghost-Admin