Weird. It's #000 on #FFF, unless my meager CSS skills have failed me. Maybe it's just too thin or something? I'll see what I can do but probably not today. /points to the markdown link in sibling comment.
The 'Lato' font is unreadably thin for me on Linux. If I turn it off (via inspect element) and allow it to use the next one (Helvetica) then it looks fine.