How to access theme fonts using custom CSS style? [closed]

The theme will likely only load a set of specific fonts, or will have options in the back-end to add extra fonts. Your problem is that Cinzel is not being loaded, if you insert the code below (preferably in to the <head>) you should find you can then utilise the font.

<link href="https://fonts.googleapis.com/css?family=Cinzel:400,700" rel="stylesheet">