message: Defaults to bold for labels
diff: import styled from 'styled-components';
  -import { display, width, space, fontSize, fontFamily, lineHeight, textColor, textAlign, alignSelf } from 'styled-system';
  +import { display, width, space, fontSize, fontFamily, fontWeight, lineHeight, textColor, textAlign, alignSelf } from 'styled-system';
  import { preset } from 'react/styles/functions';
  import { antialiased } from 'react/styles/mixins';
  @@ -14,6 +14,7 @@ export default styled.label`
  ${preset(space, { my: 2 })}
  ${preset(fontFamily, { font: 'sans' })}
  ${preset(fontSize, { f: 2 })}
  + ${preset(fontWeight, { fontWeight: 'bold' })}
  ${preset(lineHeight, { lineHeight: 1 })}
  ${preset(textColor, { color: 'gray.base' })}
  ${textAlign}
  