The Kunena team has announce the arrival of Kunena 6.2.6 [K 6.2.6] which is now available for download as a native Joomla extension for J! 4.4.x/5.0.x. This version addresses most of the issues that were discovered in K 6.1 / K 6.2 and issues discovered during the last development stages of K 6.2
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Not sure which box you mean. Use Firefox with Firebug installed and you can inspect the element you are interested in and see, and edit, the css. Depending on the element (div, span, etc.) it can sometimes be difficult to get a center alignment, but it is possible.
