XF 1.3 Styling of extra_copyright

I want extra_copyright to be displayed on a separate line from xenforo_copyright.
I tried adding a <br> at the end of the xenforo_copyright phrase, which had no effect.
When I add a <br> at the beginning of the extra_copyright phrase, that does carry over the phrase to the next line, but that line becomes centered instead of left-aligned, just like the XenForo copyright.