message: simplify BaseCSS <style> tag, `css` property
diff: @@ -14,14 +14,8 @@ const css = preval`
  module.exports = css.toString()
  `
  -export {css}
  -
  -export default function BaseCSS({children}) {
  - // FIXME: {...rest} throws errors in styled-jsx ?
  - return (
  - <style>
  - {css}
  - {children}
  - </style>
  - )
  +export default function BaseCSS() {
  + return <style name="primer">{css}</style>
  }
  +
  +BaseCSS.css = css
  