message: fix overlapping border radius on SideNav items
diff: @@ -67,6 +67,16 @@ SideNav.Link = styled(Link).attrs(props => {
  border-bottom: none;
  }
  + &:first-child {
  + border-top-right-radius: ${get('radii.2')};
  + border-top-left-radius: ${get('radii.2')};
  + }
  +
  + &:last-child {
  + border-bottom-right-radius: ${get('radii.2')};
  + border-bottom-left-radius: ${get('radii.2')};
  + }
  +
  ${SideNav}.variant-normal > & {
  color: ${get('colors.gray.6')};
  padding: ${get('space.3')};
  