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I can increase font size inside the body but the issue that this would make fonts in other areas out of sync.

Is it possible to increase font size across the whole site by 1 or 2 px ?

Thanks

Sure.
common.css line 9

You could change the font-size from 10 to 11 or 12 inside of "body".

Thanks, I am afraid that I might not have communicated it well. I was trying to say that I were able to change the body font size as per the way you indicated, however, other font sizes (like forum names) are not changed. So at the end, changing the body only will make fonts in other section not in sync with the body font size.

It works only for startpage - i see. The content-pages are more work to do.

You have to change the entrys of the different .postbody in content.css.