message: update closebutton focus
diff: -import {COMMON, LAYOUT} from '../constants'
  +import {COMMON, LAYOUT, get} from '../constants'
  import theme from '../theme'
  import sx from '../sx'
  import {XIcon} from '@primer/octicons-react'
  @@ -14,7 +14,7 @@ const StyledButton = styled.button`
  cursor: pointer;
  &:focus {
  - box-shadow: 0 0 0 3px rgba(139, 148, 158, 0.3);
  + box-shadow: ${get('buttons.default.shadow.focus')};
  }
  ${COMMON};
  ${LAYOUT};
  