react-styleguidist: Syntax highlighting not working in codemirror

What could I be doing wrong?

My markdown looks like:

React component example:

    <div>
      <JumpingDots/>
    </div>

Config:

module.exports = {
 title: 'My Great Style Guide',
  components: 'src/**/*.jsx',
  highlightTheme: "material",
//shortened for brevity
}