Q: Change The font size of "thread title" & "thread body"?

[newaccount]

how can I change the size of the "thread title" & the default size of text in "thread body"?
because I'm using N.Design Studio theme, and its text size is very small

thank's

[JonathanP]

wrong forum

[newaccount]

Oh, I'm sorry.

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I did the following in the postbit template, but no change?!
<span style="font-size: 15px;">{$post['message']}</span>

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I did change "thread title font size", but until now I didn't success in changing "thread body default font size"
thank's in advance

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Solved!