message: fix SubNav inconsistencies
diff: @@ -54,11 +54,11 @@ SubNav.Link = styled.a.attrs(props => ({
  }))`
  padding-left: ${get('space.3')};
  padding-right: ${get('space.3')};
  - min-height: 34px; // copied from TextInput, but should be a variable.
  - font-weight: ${get('fontWeights.bold')};
  + min-height: 34px;
  + font-weight: ${get('fontWeights.semibold')};
  font-size: ${get('fontSizes.1')};
  - line-height: ${get('lineHeights.default')};
  - color: ${get('colors.gray.6')};
  + line-height: 20px;
  + color: ${get('colors.gray.9')};
  text-align: center;
  text-decoration: none;
  border-top: 1px solid ${get('colors.gray.2')};
  