d: "POST",
          headers: { "Content-Type": "application/x-www-form-urlencoded" },
          body: new URLSearchParams({ zoom })
        });
    }

    function zoomIn() {
        zoom += zoomStep;
        bodyDiv.style.zoom = zoom;

        setZoomConfig(zoom);
    }

    function zoomOut() {
        zoom -= zoomStep;
        bodyDiv.style.zoom = zoom;

        setZoomConfig(zoom);
    }

    function toggleTheme() {
        document
          .querySelectorAll('link[rel=stylesheet].alternate')
       