Getting rid of duplicating code

bigbluebutton-html5/app/client/globals.coffee

@@ -330,7 +330,7 @@ Handlebars.registerHelper "getPollQuestions", ->
     $('.shield').removeClass('animatedShield')
 
 @removeFullscreenStyles = ->
-  $('#whiteboard-paper').removeClass('verticallyCentered')
+  $('#whiteboard-paper').removeClass('vertically-centered')
   $('#chat').removeClass('invisible')
   $('#users').removeClass('invisible')
   $('#navbar').removeClass('invisible')
@@ -358,7 +358,7 @@ Handlebars.registerHelper "getPollQuestions", ->
   $('.fullscreenButton').addClass('exitFullscreenButton')
   $('.fullscreenButton i').removeClass('ion-arrow-expand')
   $('.fullscreenButton i').addClass('ion-arrow-shrink')
-  $('#whiteboard-paper').addClass('verticallyCentered')
+  $('#whiteboard-paper').addClass('vertically-centered')
   $('#whiteboard').bind 'webkitfullscreenchange', (e) ->
     if document.webkitFullscreenElement is null
       $('#whiteboard').unbind('webkitfullscreenchange')

bigbluebutton-html5/app/client/stylesheets/mixins.less

@@ -10,9 +10,3 @@
   background: -webkit-linear-gradient(@color1, @color2); /* For Safari 5.1 to 6.0 */
   background: linear-gradient(@color1, @color2); /* Standard syntax (must be last) */
 }
-
-.vertically-centered {
-  position: relative;
-  top: 50%;
-  transform: translateY(-50%);
-}

bigbluebutton-html5/app/client/stylesheets/style.less

@@ -736,12 +736,6 @@ body {
   }
 }
 
-.verticallyCentered {
-  position: relative;
-  top: 50%;
-  transform: translateY(-50%);
-}
-
 /* Sliding Menu */
 
 @media @desktop-portrait {
@@ -980,8 +974,6 @@ body {
     -moz-animation-delay:0.845s;
 }
 
-
-
 @keyframes f_fadeG{
   0%{
     background-color:rgb(0,0,0);