Change Default Font CSS

[tomtomg]

Probably a basic question I suspect, but it's bugging me.

Assigning CSS to fonts throughout the website, all fine and dandy. However, where do I go to alter this CSS? For example, if I want to change the font size of "Heading 3".
Also, how do I create a new CSS and apply it to text?

I've gone through the Additional CSS in the site theme but it doesn't seem to be doing anything...

[NathanC]

Click on 'View default CSS code' below additional CSS and find / search for 'h3' then copy this into the additional CSS and alter as you require. ( Make sure to preview your changes before clicking the green tick ).

You would need to create a class or id to wrap the text in and then create the required CSS for the new class or id in the additional CSS.