For all Joomla 3+ templates built using the Zen Grid Framework v4 (any theme after October 2014) please refer to the Zen Grid Framework v4 documentation.
The font stacks section of the template administrator controls the appearance of the fonts on your site. These styles are written to the body class of the template and a container div int he template.
The Zen Grid Framework is able to load a selection of font stacks that are commonly available across the web and it also has the capacity to load fonts from the Google web font directory. There are 18 different font families available in the repository and unlike other font replacement techniques the Google font solution is standard across browsers. For a full run down of the fonts available please check the font directory itself or view the screenshot below.
Font family body: This setting controls the font stack available for the body text on the page.
Font family headings: This setting controls the font used for the headings on the page.
Navigation font stack: This setting controls the font used for the menu links on the page when the main menu is published to the menu module position.
Font size: this value controls the base font size for the site. This setting may need to do for according to the font stacks you have applied in the settings above.