diff --git a/README.md b/README.md
index dd7d8201..fd58c718 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,9 @@ Reveal.initialize({
 	// Enable the slide overview mode
 	overview: true,
 
+	// Vertical centering of slides
+	center: false,
+
 	// Loop the presentation
 	loop: false,
 
diff --git a/css/reveal.css b/css/reveal.css
index c6545057..5f6a023c 100644
--- a/css/reveal.css
+++ b/css/reveal.css
@@ -490,10 +490,10 @@ body {
  *********************************************/
 
 .reveal {
+	position: relative;
 	width: 100%;
 	height: 100%;
-	min-height: 600px;
-	position: relative;
+	min-height: 640px; /* min height + 40 to account for padding */
 }
 
 .reveal .slides {
@@ -504,9 +504,9 @@ body {
 	left: 50%;
 	top: 50%;
 	padding: 20px 0px;
+	
 	overflow: visible;
 	z-index: 1;
-
 	text-align: center;
 
 	-webkit-transition: -webkit-perspective .4s ease;
@@ -520,10 +520,10 @@ body {
 	    -ms-perspective: 600px;
 	        perspective: 600px;
 
-	-webkit-perspective-origin: 0% 0%;
-	   -moz-perspective-origin: 0% 0%;
-	    -ms-perspective-origin: 0% 0%;
-	        perspective-origin: 0% 0%;
+	-webkit-perspective-origin: 0% -25%;
+	   -moz-perspective-origin: 0% -25%;
+	    -ms-perspective-origin: 0% -25%;
+	        perspective-origin: 0% -25%;
 }
 
 .reveal .slides>section,
@@ -566,14 +566,14 @@ body {
 }
 
 .reveal .slides>section {
-	margin-left: -50%;
-	margin-top: -50%;
+	left: -50%;
+	top: -50%;
 }
 
 .reveal.center,
 .reveal.center .slides {
-	padding: 0;
 	min-height: auto;
+	padding: 0;
 }
 
 
diff --git a/index.html b/index.html
index de0637c2..82570f34 100644
--- a/index.html
+++ b/index.html
@@ -350,6 +350,7 @@ function linkify( selector ) {
 				controls: true,
 				progress: true,
 				history: true,
+				center: true,
 
 				theme: Reveal.getQueryHash().theme, // available themes are in /css/theme
 				transition: Reveal.getQueryHash().transition || 'default', // default/cube/page/concave/zoom/linear/none
diff --git a/js/reveal.js b/js/reveal.js
index a1683ec0..564c863a 100644
--- a/js/reveal.js
+++ b/js/reveal.js
@@ -1,5 +1,5 @@
 /*!
- * reveal.js 2.1 r37
+ * reveal.js 2.2 r38
  * http://lab.hakim.se/reveal-js
  * MIT licensed
  *
@@ -29,6 +29,7 @@ var Reveal = (function(){
 			// Enable the slide overview mode
 			overview: true,
 
+			// Vertical centering of slides
 			center: false,
 
 			// Loop the presentation
@@ -465,6 +466,7 @@ var Reveal = (function(){
 	 * presentation.
 	 */
 	function layout() {
+
 		if( config.center ) {
 
 			// Select all slides, vertical and horizontal
@@ -476,15 +478,18 @@ var Reveal = (function(){
 			for( var i = 0, len = slides.length; i < len; i++ ) {
 				var slide = slides[ i ];
 
+				// Vertical stacks are not centered since their section 
+				// children will be
 				if( slide.classList.contains( 'stack' ) ) {
-					slide.style.marginTop = 0;
+					slide.style.top = 0;
 				}
 				else {
-					slide.style.marginTop = Math.max( - ( slide.offsetHeight / 2 ) - 20, minTop ) + 'px';
+					slide.style.top = Math.max( - ( slide.offsetHeight / 2 ) - 20, minTop ) + 'px';
 				}
 			}
 
 		}
+
 	}
 
 	/**
diff --git a/js/reveal.min.js b/js/reveal.min.js
index e31d807c..31676651 100644
--- a/js/reveal.min.js
+++ b/js/reveal.min.js
@@ -1,83 +1,86 @@
 /*!
- * reveal.js 2.1 r37
+ * reveal.js 2.2 r38
  * http://lab.hakim.se/reveal-js
  * MIT licensed
  *
  * Copyright (C) 2011-2012 Hakim El Hattab, http://hakim.se
  */
-var Reveal=(function(){var l=".reveal .slides>section",b=".reveal .slides>section.present>section",R={controls:true,progress:true,history:false,keyboard:true,overview:true,loop:false,autoSlide:0,mouseWheel:true,rollingLinks:true,theme:null,transition:"default",dependencies:[]},Y=R.autoSlide,m=0,e=0,y,G,ak=[],f={},T="WebkitPerspective" in document.body.style||"MozPerspective" in document.body.style||"msPerspective" in document.body.style||"OPerspective" in document.body.style||"perspective" in document.body.style,n="WebkitTransform" in document.body.style||"MozTransform" in document.body.style||"msTransform" in document.body.style||"OTransform" in document.body.style||"transform" in document.body.style,z=0,k=0,D=0,ac={startX:0,startY:0,startSpan:0,startCount:0,handled:false,threshold:80};
-function i(al){if((!n&&!T)){document.body.setAttribute("class","no-transforms");return;}t(R,al);d();V();}function P(){f.theme=document.querySelector("#theme");
-f.wrapper=document.querySelector(".reveal");if(!f.wrapper.querySelector(".progress")&&R.progress){var ao=document.createElement("div");ao.classList.add("progress");
-ao.innerHTML="<span></span>";f.wrapper.appendChild(ao);}if(!f.wrapper.querySelector(".controls")&&R.controls){var an=document.createElement("aside");an.classList.add("controls");
-an.innerHTML='<div class="left"></div><div class="right"></div><div class="up"></div><div class="down"></div>';f.wrapper.appendChild(an);}if(!f.wrapper.querySelector(".state-background")){var am=document.createElement("div");
-am.classList.add("state-background");f.wrapper.appendChild(am);}if(!f.wrapper.querySelector(".pause-overlay")){var al=document.createElement("div");al.classList.add("pause-overlay");
-f.wrapper.appendChild(al);}f.progress=document.querySelector(".reveal .progress");f.progressbar=document.querySelector(".reveal .progress span");if(R.controls){f.controls=document.querySelector(".reveal .controls");
+var Reveal=(function(){var m=".reveal .slides>section",b=".reveal .slides>section.present>section",T={controls:true,progress:true,history:false,keyboard:true,overview:true,center:false,loop:false,autoSlide:0,mouseWheel:true,rollingLinks:true,theme:null,transition:"default",dependencies:[]},aa=T.autoSlide,n=0,e=0,z,H,am=[],f={},V="WebkitPerspective" in document.body.style||"MozPerspective" in document.body.style||"msPerspective" in document.body.style||"OPerspective" in document.body.style||"perspective" in document.body.style,o="WebkitTransform" in document.body.style||"MozTransform" in document.body.style||"msTransform" in document.body.style||"OTransform" in document.body.style||"transform" in document.body.style,A=0,l=0,E=0,ae={startX:0,startY:0,startSpan:0,startCount:0,handled:false,threshold:80};
+function j(an){if((!o&&!V)){document.body.setAttribute("class","no-transforms");return;}u(T,an);d();X();}function Q(){f.theme=document.querySelector("#theme");
+f.wrapper=document.querySelector(".reveal");if(!f.wrapper.querySelector(".progress")&&T.progress){var aq=document.createElement("div");aq.classList.add("progress");
+aq.innerHTML="<span></span>";f.wrapper.appendChild(aq);}if(!f.wrapper.querySelector(".controls")&&T.controls){var ap=document.createElement("aside");ap.classList.add("controls");
+ap.innerHTML='<div class="left"></div><div class="right"></div><div class="up"></div><div class="down"></div>';f.wrapper.appendChild(ap);}if(!f.wrapper.querySelector(".state-background")){var ao=document.createElement("div");
+ao.classList.add("state-background");f.wrapper.appendChild(ao);}if(!f.wrapper.querySelector(".pause-overlay")){var an=document.createElement("div");an.classList.add("pause-overlay");
+f.wrapper.appendChild(an);}f.progress=document.querySelector(".reveal .progress");f.progressbar=document.querySelector(".reveal .progress span");if(T.controls){f.controls=document.querySelector(".reveal .controls");
 f.controlsLeft=document.querySelector(".reveal .controls .left");f.controlsRight=document.querySelector(".reveal .controls .right");f.controlsUp=document.querySelector(".reveal .controls .up");
 f.controlsDown=document.querySelector(".reveal .controls .down");}}function d(){if(navigator.userAgent.match(/(iphone|ipod|android)/i)){document.documentElement.style.overflow="scroll";
-document.body.style.height="120%";window.addEventListener("load",ad,false);window.addEventListener("orientationchange",ad,false);}}function V(){var am=[],aq=[];
-for(var an=0,al=R.dependencies.length;an<al;an++){var ao=R.dependencies[an];if(!ao.condition||ao.condition()){if(ao.async){aq.push(ao.src);}else{am.push(ao.src);
-}if(typeof ao.callback==="function"){head.ready(ao.src.match(/([\w\d_\-]*)\.?[^\\\/]*$/i)[0],ao.callback);}}}function ap(){if(aq.length){head.js.apply(null,aq);
-}H();}if(am.length){head.ready(ap);head.js.apply(null,am);}else{ap();}}function H(){P();E();K();J();O();setTimeout(function(){r("ready",{indexh:m,indexv:e,currentSlide:G});
-},1);}function K(){if(T===false){R.transition="linear";}if(R.controls&&f.controls){f.controls.style.display="block";}if(R.progress&&f.progress){f.progress.style.display="block";
-}if(R.transition!=="default"){f.wrapper.classList.add(R.transition);}if(R.mouseWheel){document.addEventListener("DOMMouseScroll",o,false);document.addEventListener("mousewheel",o,false);
-}if(R.rollingLinks){N();}if(R.theme&&f.theme){var an=f.theme.getAttribute("href");var al=/[^\/]*?(?=\.css)/;var am=an.match(al)[0];if(R.theme!==am){an=an.replace(al,R.theme);
-f.theme.setAttribute("href",an);}}}function E(){document.addEventListener("touchstart",A,false);document.addEventListener("touchmove",af,false);document.addEventListener("touchend",W,false);
-window.addEventListener("hashchange",w,false);if(R.keyboard){document.addEventListener("keydown",ah,false);}if(R.progress&&f.progress){f.progress.addEventListener("click",q(ai),false);
-}if(R.controls&&f.controls){f.controlsLeft.addEventListener("click",q(B),false);f.controlsRight.addEventListener("click",q(j),false);f.controlsUp.addEventListener("click",q(u),false);
-f.controlsDown.addEventListener("click",q(F),false);}}function U(){document.removeEventListener("keydown",ah,false);document.removeEventListener("touchstart",A,false);
-document.removeEventListener("touchmove",af,false);document.removeEventListener("touchend",W,false);window.removeEventListener("hashchange",w,false);if(R.progress&&f.progress){f.progress.removeEventListener("click",q(ai),false);
-}if(R.controls&&f.controls){f.controlsLeft.removeEventListener("click",q(B),false);f.controlsRight.removeEventListener("click",q(j),false);f.controlsUp.removeEventListener("click",q(u),false);
-f.controlsDown.removeEventListener("click",q(F),false);}}function t(am,al){for(var an in al){am[an]=al[an];}}function S(an,al){var ao=an.x-al.x,am=an.y-al.y;
-return Math.sqrt(ao*ao+am*am);}function q(al){return function(am){am.preventDefault();al.call(null,am);};}function ad(){setTimeout(function(){window.scrollTo(0,1);
-},0);}function r(am,al){var an=document.createEvent("HTMLEvents",1,2);an.initEvent(am,true,true);t(an,al);f.wrapper.dispatchEvent(an);}function N(){if(T&&!("msPerspective" in document.body.style)){var am=document.querySelectorAll(".reveal .slides section a:not(.image)");
-for(var an=0,al=am.length;an<al;an++){var ao=am[an];if(ao.textContent&&!ao.querySelector("img")&&(!ao.className||!ao.classList.contains(ao,"roll"))){ao.classList.add("roll");
-ao.innerHTML='<span data-title="'+ao.text+'">'+ao.innerHTML+"</span>";}}}}function I(){if(R.overview){f.wrapper.classList.add("overview");var al=document.querySelectorAll(l);
-for(var aq=0,ao=al.length;aq<ao;aq++){var an=al[aq],av="translateZ(-2500px) translate("+((aq-m)*105)+"%, 0%)";an.setAttribute("data-index-h",aq);an.style.display="block";
-an.style.WebkitTransform=av;an.style.MozTransform=av;an.style.msTransform=av;an.style.OTransform=av;an.style.transform=av;if(!an.classList.contains("stack")){an.addEventListener("click",C,true);
-}var au=an.querySelectorAll("section");for(var ap=0,am=au.length;ap<am;ap++){var at=au[ap],ar="translate(0%, "+((ap-(aq===m?e:0))*105)+"%)";at.setAttribute("data-index-h",aq);
-at.setAttribute("data-index-v",ap);at.style.display="block";at.style.WebkitTransform=ar;at.style.MozTransform=ar;at.style.msTransform=ar;at.style.OTransform=ar;
-at.style.transform=ar;at.addEventListener("click",C,true);}}}}function ae(){if(R.overview){f.wrapper.classList.remove("overview");var ao=Array.prototype.slice.call(document.querySelectorAll(".reveal .slides section"));
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-am.style.transform="";am.removeEventListener("click",C);}a();}}function X(al){if(typeof al==="boolean"){al?I():ae();}else{L()?ae():I();}}function L(){return f.wrapper.classList.contains("overview");
-}function ab(){var al=document.body;var am=al.requestFullScreen||al.webkitRequestFullScreen||al.mozRequestFullScreen||al.msRequestFullScreen;if(am){am.apply(al);
-}}function c(){f.wrapper.classList.add("paused");}function p(){f.wrapper.classList.remove("paused");}function aa(){if(ag()){p();}else{c();}}function ag(){return f.wrapper.classList.contains("paused");
-}function a(ar,aw){y=G;var ao=ak.concat();ak.length=0;var av=m,am=e;m=aj(l,ar===undefined?m:ar);e=aj(b,aw===undefined?e:aw);stateLoop:for(var ap=0,at=ak.length;
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-}while(ao.length){document.documentElement.classList.remove(ao.pop());}if(R.progress&&f.progress){f.progressbar.style.width=(m/(document.querySelectorAll(l).length-1))*window.innerWidth+"px";
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-}else{y=null;}if(y){y.classList.remove("present");}}function aj(ao,au){var am=Array.prototype.slice.call(document.querySelectorAll(ao)),at=am.length;if(at){if(R.loop){au%=at;
-if(au<0){au=at+au;}}au=Math.max(Math.min(au,at-1),0);for(var aq=0;aq<at;aq++){var ar=am[aq];if(L()===false){var al=Math.abs((au-aq)%(at-3))||0;ar.style.display=al>3?"none":"block";
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-}}if(ar.querySelector("section")){am[aq].classList.add("stack");}}am[au].classList.add("present");var an=am[au].getAttribute("data-state");if(an){ak=ak.concat(an.split(" "));
-}var ap=am[au].getAttribute("data-autoslide");if(ap){Y=parseInt(ap);}else{Y=R.autoSlide;}}else{au=0;}return au;}function s(){if(R.controls&&f.controls){var al=g();
-[f.controlsLeft,f.controlsRight,f.controlsUp,f.controlsDown].forEach(function(am){am.classList.remove("enabled");});if(al.left){f.controlsLeft.classList.add("enabled");
-}if(al.right){f.controlsRight.classList.add("enabled");}if(al.up){f.controlsUp.classList.add("enabled");}if(al.down){f.controlsDown.classList.add("enabled");
-}}}function g(){var al=document.querySelectorAll(l),am=document.querySelectorAll(b);return{left:m>0,right:m<al.length-1,up:e>0,down:e<am.length-1};}function J(){var aq=window.location.hash;
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-a(ar.h,ar.v);}else{a(m,e);}}else{var ao=parseInt(ap[0],10)||0,al=parseInt(ap[1],10)||0;a(ao,al);}}function h(){if(R.history){var al="/";if(m>0||e>0){al+=m;
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-}var al=true;switch(an.keyCode){case 80:case 33:Z();break;case 78:case 34:x();break;case 72:case 37:B();break;case 76:case 39:j();break;case 75:case 38:u();
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-}}function af(aq){if(!ac.handled){var ao=aq.touches[0].clientX;var an=aq.touches[0].clientY;if(aq.touches.length===2&&ac.startCount===2&&R.overview){var ap=S({x:aq.touches[1].clientX,y:aq.touches[1].clientY},{x:ac.startX,y:ac.startY});
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-if(am>ac.threshold&&Math.abs(am)>Math.abs(al)){ac.handled=true;B();}else{if(am<-ac.threshold&&Math.abs(am)>Math.abs(al)){ac.handled=true;j();}else{if(al>ac.threshold){ac.handled=true;
-u();}else{if(al<-ac.threshold){ac.handled=true;F();}}}}aq.preventDefault();}}}else{if(navigator.userAgent.match(/android/gi)){aq.preventDefault();}}}function W(al){ac.handled=false;
-}function o(al){clearTimeout(z);z=setTimeout(function(){var am=al.detail||-al.wheelDelta;if(am>0){x();}else{Z();}},100);}function ai(am){var al=Array.prototype.slice.call(document.querySelectorAll(l)).length;
-var an=Math.floor((am.clientX/f.wrapper.offsetWidth)*al);a(an);}function w(al){J();}function C(al){if(L()){al.preventDefault();ae();m=this.getAttribute("data-index-h");
-e=this.getAttribute("data-index-v");a();}}return{initialize:i,slide:a,left:B,right:j,up:u,down:F,prev:Z,next:x,prevFragment:Q,nextFragment:v,navigateTo:a,navigateLeft:B,navigateRight:j,navigateUp:u,navigateDown:F,navigatePrev:Z,navigateNext:x,toggleOverview:X,addEventListeners:E,removeEventListeners:U,getIndices:M,getPreviousSlide:function(){return y;
-},getCurrentSlide:function(){return G;},getQueryHash:function(){var al={};location.search.replace(/[A-Z0-9]+?=(\w*)/gi,function(am){al[am.split("=").shift()]=am.split("=").pop();
-});return al;},addEventListener:function(am,an,al){if("addEventListener" in window){(f.wrapper||document.querySelector(".reveal")).addEventListener(am,an,al);
-}},removeEventListener:function(am,an,al){if("addEventListener" in window){(f.wrapper||document.querySelector(".reveal")).removeEventListener(am,an,al);
+document.body.style.height="120%";window.addEventListener("load",af,false);window.addEventListener("orientationchange",af,false);}}function X(){var ao=[],at=[];
+for(var ap=0,an=T.dependencies.length;ap<an;ap++){var aq=T.dependencies[ap];if(!aq.condition||aq.condition()){if(aq.async){at.push(aq.src);}else{ao.push(aq.src);
+}if(typeof aq.callback==="function"){head.ready(aq.src.match(/([\w\d_\-]*)\.?[^\\\/]*$/i)[0],aq.callback);}}}function ar(){if(at.length){head.js.apply(null,at);
+}I();}if(ao.length){head.ready(ar);head.js.apply(null,ao);}else{ar();}}function I(){Q();F();L();R();K();P();setTimeout(function(){s("ready",{indexh:n,indexv:e,currentSlide:H});
+},1);}function L(){if(V===false){T.transition="linear";}if(T.controls&&f.controls){f.controls.style.display="block";}if(T.progress&&f.progress){f.progress.style.display="block";
+}if(T.transition!=="default"){f.wrapper.classList.add(T.transition);}if(T.center){f.wrapper.classList.add("center");}if(T.mouseWheel){document.addEventListener("DOMMouseScroll",p,false);
+document.addEventListener("mousewheel",p,false);}if(T.rollingLinks){O();}if(T.theme&&f.theme){var ap=f.theme.getAttribute("href");var an=/[^\/]*?(?=\.css)/;
+var ao=ap.match(an)[0];if(T.theme!==ao){ap=ap.replace(an,T.theme);f.theme.setAttribute("href",ap);}}}function F(){document.addEventListener("touchstart",B,false);
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