o2_control");

    demo1_active.addEventListener("change", function () {
      if (this.checked) {
        this.parentNode.classList.remove("inactive");
      } else {
        this.parentNode.classList.add("inactive");
      }
    });

    demo2_active.addEventListener("change", function () {
      if (this.checked) {
        this.parentNode.classList.remove("inactive");
      } else {
        this.parentNode.classList.add("inactive");
      }
    });

    function fillCode() {
      editable1.innerHTML = t