全局样式

https://styled-components.com/docs/api#createglobalstyle 可以用来替代 global.less

import { createGlobalStyle } from 'styled-components'
const GlobalStyle = createGlobalStyle`
  body {
    color: ${props => (props.whiteColor ? 'white' : 'black')};
  }
`
// later in your app
<React.Fragment>
  <GlobalStyle whiteColor />
  <Navigation /> {/* example of other top-level stuff */}
</React.Fragment>