message: position SideNav
diff: import React from 'react'
  import PropTypes from 'prop-types'
  import {NavLink} from 'react-router-dom'
  -import {Box} from '../../src'
  +import {Box, Relative} from '../../src'
  export default function SideNav({basename, title, examples, ...rest}) {
  return (
  - <Box {...rest}>
  + <Relative p={4} {...rest}>
  <nav className="menu">
  <NavLink to={basename} className="menu-heading no-underline link-gray-dark">
  {title}
  @@ -21,7 +21,7 @@ export default function SideNav({basename, title, examples, ...rest}) {
  </NavLink>
  ))}
  </nav>
  - </Box>
  + </Relative>
  )
  }
  