There have been no recent threads, so there is nothing to display. You could change AdminCP > Settings > Options > External Data Provider >Topic Cutoff to something larger to include the old threads.
I don't understand what you want to center (how you want it to look), so I can't even guess at some CSS. I'd suggest using your browser web tools (similar to firebug) to play with the CSS and see what you want to do.
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