How to make user nick name bigger ?

Hi,

Can anyone help me with making user nick name (font) bigger ? I want to make user nick name bigger, but only at post site:

https://2img.net/h/oi50.tinypic.com/i78m7o.jpg

So...how can I make it bigger ?

Thx ^^

Administration Panel=>Display=>Pictures and Colors=>Colors=>Colors and text size=>Links font size
But not working on versions of phpBB3 forum and perhaps even to Invision (here not sure).

Yes, but if I change font size from Display it will change whole font size from Portal, Post Site and User name...
I want to change size for user nick name ONLY !

What code should I past in CSS ?

I know something is impossible, not even a CSS not think I can help.

Ok, but maybe other will know ? ^^

If its possible, to change it in the CSS, so i dont need to change the size of other text included along with the username.

This would be more usefull solution for me.

your not going to be able to do it just for certain areas.
you can change the font size everywhere for username and other text as well or you will just have to leave it like it is.