Now that styles are set in
theme-ui, we need to actually use them in our application.
First, we'll override the default
theme-ui config by shadowing the
theme object in
gatsby-theme-ui/index.js and start using the theme throughout.
For a written version of this course, check out the Gatsby docs.
Shouldn't it be overriding gatsby-plugin-theme-ui/index.js instead of gatsby-theme-ui/index.js?