message: Correct case of css -> CSS in the README
diff: @@ -207,7 +207,7 @@ class CustomGraphiQL extends React.Component {
  ### Applying a CodeMirror Theme
  -In order to theme the editor portions of the interface, you can supply a `codeMirrorTheme` prop. You'll also need to load the appropriate css for the theme (similar to loading the CSS for this project) in order for your theme to function properly. [See the themes available here](https://codemirror.net/demo/theme.html).
  +In order to theme the editor portions of the interface, you can supply a `codeMirrorTheme` prop. You'll also need to load the appropriate CSS for the theme (similar to loading the CSS for this project) in order for your theme to function properly. [See the themes available here](https://codemirror.net/demo/theme.html).
  ```js
  