ithub.com/hakimel/reveal.js#configuration
      Reveal.initialize({
        // Push each slide change to the browser history
        history: true,
        // Vertical centering of slides
        center: false,
        // Transition style
        transition: 'none', // none/fade/slide/convex/concave/zoom
        // Transition style for full page slide backgrounds
        backgroundTransition: 'default', // none/fade/slide/convex/concave/zoom



        // Optional reveal.js plugins
        dependencies: [
 