how to get text area more narrow + is it possible change font on only F1 F2

Hi! I'm using a Catch theme the first time, Catch Everest free version, and its great! Thanks for making this! I have som trouble though. I'm trying to get the text on my sides (not homepage) to get more narrow and still responsive. I'm not very experienced in programming yet. Also I would like to change the font only for the headlines, H1 H2 etc. Is that possible? Kind regards Lisa* Ps. the site is under construction and therefor you can't look at it for the moment. If you need to pleas tell me and I'll unlock it!