"Fixed" a bug in sidebar spacing, where it overlapped with the text flowing beow it.
"Fixed" a bug in sidebar spacing, where it overlapped with the text flowing beow it.

I say it's "fixed" because I just added some padding, but there is something wrong with the
arithmetic there.

liuyi1112/rst2pdf,rst2pdf/rst2pdf,rst2pdf/rst2pdf,liuyi1112/rst2pdf,pombreda/rst2pdf,pombreda/rst2pdf