@atlaskit/editor-common/dist/es2019/styles/shared/rule.js

A package that contains common classes and components for editor and renderer

import { css } from '@emotion/react';
import { akEditorLineHeight } from '@atlaskit/editor-shared-styles';
import { N30A } from '@atlaskit/theme/colors';
// @see typography spreadsheet: https://docs.google.com/spreadsheets/d/1iYusRGCT4PoPfvxbJ8NrgjtfFgXLm5lpDWXzjua1W2E/edit#gid=93913128
export const ruleSharedStyles = () => css({
  '& hr': {
    border: 'none',
    backgroundColor: `var(--ds-border, ${N30A})`,
    // eslint-disable-next-line @atlaskit/design-system/ensure-design-token-usage/preview
    margin: `${akEditorLineHeight}em 0`,
    height: '2px',
    borderRadius: '1px'
  }
});