The <Global> component has an attribute, styles, which in turn takes a css function as it's value.
The css function takes as it's argument a tagged template literal, which in this case consists of a string of standard CSS contained within backticks. You can put any CSS here that you want to be applied site wide.
When you save the file you should notice that the fonts on your site have now changed automatically to be sans-serif.
Next we'll look at the power and flexibility that styled components give us.