Modals.create("demo-modal", {
  title: "Demo modal",
  body: modal => "<p class=\"text\">Modal content</p>",
  actions: modal => {
    const close = document.createElement("button");
    close.className = "btn btn-primary";
    close.textContent = "Close";
    close.addEventListener("click", () => modal.close());
    return [close];
  }
}).show();