How to change the colour of the text in one banner without affecting all other banners in Adversary

My entire site is made up of banners, and therefore all of the banners text is the same size, colour, etc. I'd like the banner on my contact page to be a different colour, but in changing the colour in the style editor, it affects all of the banners site-wide.

Is there anyone that could give me a step by step on how to install custom code to fix this? I do not know how to work with custom code at all :/

Here's a link to the page The word "CONTACT" should be above the form (but it's invisible because it's currently white like the other banner titles on the site): www.backroadproductions.ca

THANK YOU SO MUCH!