Question

How to change font size in comments?

Answer 1

Add the following code to qa-styles.css: 

div.qa-c-item-content div.entry-content {font-size:12px;}

Replacing "12px" with any  desired value.  

Comments

Thank you very much.

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If you look at the core's code you'll see the entry-content div is only added when microformats is enabled. So if microformats is disabled then this will have no effect. I've already explained how to change this in this answer http://www.question2answer.org/qa/33067#a33073