s
                parallaxBackgroundHorizontal: null,
                parallaxBackgroundVertical: null,


                //------------------------------------------------------------
                // Optional reveal.js plugins
                dependencies: [
                    { src: 'reveal-js/lib/js/classList.js',
                      condition: function() { return !document.body.classList; } },
                    { src: 'reveal-js/plugin/markdown/marked.js',
                      condition: functi