Simple pardot detect iframe add class to body

detect-pardot-editor-simple.html

<script type="text/javascript">
  document.addEventListener('DOMContentLoaded', function () {

      function isIframe() {
          try {
              return window.self !== window.top;
          } catch (e) {
              return true;
          }
      }

      if (isIframe()) {
          document.body.classList.add('is-pardot-editor');
      }
  });

</script>

<style>
  body.is-pardot-editor{
    /*--add CSS here ---*/
  }
</style>