buttons.js

const ButtonBox: React.FC = () => {
  return (
    <div id="buttonBox">
      <a className="button cta-btn" href="https://app.query.delivery/people/new/">
        지금 무료로 사용하기
      </a>
    
      <a className="button" href="https://www.notion.so/hops/fc293ffe8ffe4ea680a13662432e7538">
        서비스 소개
      </a>
    </div>
  );
};

const insertAfter = (elem,  targetElement) => {
    const appendElem = document.createElement('div');
    appendElem.setAttribute('id', id);
    targetElement.parentElement.insertBefore(appendElem, targetElement.nextSibling);

    ReactDOM.render(elem, appendElem);
};

document.onload = function () {
  insertAfter(<ButtonBox />, document.querySelector('div[data-block-id="96b9c104-33f6-4b86-aac0-7ca99d5ac56b"]'))
};