How to add css classes?

[kennetpostigo]

Hello,

I'm currently working on a site with gatsby and I wanted to know how to add a css class to the markdown that will be rendered to a react-component.

for example:

# List
1. one
2. two
3. three

how can I add a class to the h1 and ol with gatsby?

[KyleAMathews]

Take a look at the Kitchen Sink Starter — it shows how to add a markdown-it plugin which adds syntax for adding classes to markdown.

http://gatsbyjs.github.io/gatsby-starter-default/markdown/