Kamu dapat customize styling dengan memberikan renderMark pada options dibawah ini:
https://www.gatsbyjs.com/blog/how-to-use-the-contentful-rich-text-field-with-gatsby/
const options = { renderMark: { [MARKS.BOLD]: (text) => { return <b>{text}</b>; }, [MARKS.ITALIC]: (text) => { return <i>{text}</i>; }, [MARKS.UNDERLINE]: (text) => { return <u>{text}</u>; }, [MARKS.CODE]: (text) => { return <code>{text}</code>; }, [MARKS.SUPERSCRIPT]: (text) => { return <sup>{text}</sup>; }, [MARKS.SUBSCRIPT]: (text) => { return <sub>{text}</sub>; }, }, renderNode: { [BLOCKS.HEADING_1]: (node, children) => { return <h1>{children}</h1>; }, [BLOCKS.HEADING_2]: (node, children) => { return <h2>{children}</h2>; }, [BLOCKS.HEADING_3]: (node, children) => { return <h3>{children}</h3>; }, [BLOCKS.HEADING_4]: (node, children) => { return <h4>{children}</h4>; }, [BLOCKS.HEADING_5]: (node, children) => { return <h5>{children}</h5>; }, [BLOCKS.HEADING_6]: (node, children) => { return <h6>{children}</h6>; }, [BLOCKS.PARAGRAPH]: (node, children) => { return <p>{children}</p>; }, [BLOCKS.HR]: () => { return <hr className="hr" />; }, [BLOCKS.OL_LIST]: (node, children) => { return <ol className="ol">{children}</ol>; }, [BLOCKS.UL_LIST]: (node, children) => { return <ul className="ul">{children}</ul>; }, [BLOCKS.QUOTE]: (node, children) => { return <blockquote className="blockquote">{children}</blockquote>; }, [BLOCKS.TABLE]: (node, children) => { return <table className="table"><tbody>{children}</tbody></table>; }, [INLINES.HYPERLINK]: (node, children) => ( <a href={node.data.uri} target="_blank" rel="noreferrer" className="text-brand-default underline" >{children}</a> ), [BLOCKS.EMBEDDED_ASSET]: (node) => { const { gatsbyImageData, title } = node.data.target; return <GatsbyImage image={getImage(gatsbyImageData)} alt={title} />; }, }, };