message: position new SideNav
diff: import React from 'react'
  import {default as NextLink} from 'next/link'
  -import {Text, Box, Button, FlexContainer} from '../../src'
  +import {Text, Box, Button, FlexContainer, Relative} from '../../src'
  import * as docs from '../components'
  const SideNav = () => (
  - <Box bg="gray.0">
  + <Relative>
  + <Box p={4} bg="gray.0" display="inline-block">
  <FlexContainer flexDirection="column" alignItems="start" p={5} borderBottom={1} borderColor="gray.2">
  <NextLink href="/getting-started">
  <Button linkStyle color="black" m={0} mb={3}>
  @@ -37,6 +38,7 @@ const SideNav = () => (
  ))}
  </Box>
  </Box>
  + </Relative>
  )
  export default SideNav
  