$(document).ready(function() {
  // Handler for .ready() called.
  
 var width = $(window).width();
 var height = $(window).height();
 
 $(".logo").css( { top: ((height/2)-100)+"px", left: ((width/2)-317/2)+"px" } );
  
});

$(window).resize(function() {
 var width = $(window).width();
 var height = $(window).height();
 
 $(".logo").css( { top: ((height/2)-100)+"px", left: ((width/2)-317/2)+"px" } );
	
});