Embargo custom button

gistfile1.html

<script>
      (function () {
        const insertButtons = (containerNode) => {
          containerNode
            .querySelectorAll(".fixr-event-item__footer")
            .forEach((node) => {
              if (node.querySelector("[data-external-button]")) return;

              const item = node.firstChild.cloneNode(true);
              item.style.marginRight = "auto";
              item.style.marginLeft = "16px";
              item.addEventListener("click", () => {
                $("#enquirePopupModal").modal("show");
              });
              item.setAttribute("data-external-button", true);

              const buttonText = item.querySelector("button > div");
              buttonText.innerText = "Get Table";

              node.firstChild.insertAdjacentElement("afterend", item);
            });
        };

        const observeTicketshop = () => {
          const targetNode = document.querySelector(".fixr-events-widget");
          insertButtons(targetNode);
          const config = {
            attributes: false,
            childList: true,
            subtree: true,
          };

          const callback = (mutationList, observer) => {
            insertButtons(targetNode);
          };

          const observer = new MutationObserver(callback);
          observer.observe(targetNode, config);
        };

        window.addEventListener("message", (e) => {
          if (e.data && e.data.message === "fixr.widget:loaded") {
            observeTicketshop();
          }
        });
      })();
</script>