Use the built-in prismPreset option to add prism highlighting to gatsby-theme-blog.
Note that this is only available in Blog Theme 2.0 and beyond.
0:19 Go to your gatsby-config file and edit your setup for your gatsby-theme-blog plugin. Add the option prismPreset and set whichever theme UI preset you'd like to use for prism, in this case prism-okaidia.
0:38 Run gatsby develop and navigate to your blog post. Once there, you can see your code snippet with prism highlighting.
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