message: [skip ci] update BaseCSS.css usage instructions
diff: @@ -55,7 +55,7 @@ export default () => (
  If you can't use React to render your document shell server-side, you have two other options:
  1. Include `node_modules/primer-react/dist/css/build.css` by copying or other means.
  -1. `import {BaseCSS: {css}} from 'primer-react'` and output the `css` string directly.
  +1. `import {BaseCSS} from 'primer-react'` and output the `BaseCSS.css` CSS string directly.
  #### Static CSS rendering
  