message: add sx to ButtonClose
diff: -import {get, COMMON, LAYOUT} from '../constants'
  +import {COMMON, LAYOUT} from '../constants'
  import theme from '../theme'
  +import sx from '../sx'
  import {XIcon} from '@primer/octicons-react'
  import React from 'react'
  import PropTypes from 'prop-types'
  @@ -17,6 +18,7 @@ const StyledButton = styled.button`
  }
  ${COMMON};
  ${LAYOUT};
  + ${sx};
  `
  const ButtonClose = (props) => (
  @@ -34,6 +36,7 @@ ButtonClose.propTypes = {
  onClick: PropTypes.func,
  ...COMMON.propTypes,
  ...LAYOUT.propTypes,
  + ...sx.propTypes,
  }
  export default ButtonClose
  