text: 
  $(window).resize(function resizes() {
       if($(window).width() == 800)// u can choose the size of the window also.
              $("whitebox").css("font-size","20px");
  			$(".instapic").css("background-color", "#00FFFF");		
  });
  if($(window).width()==800){
  	$("whitebox").css("font-size","20px");
  
  }
  if($(window).width()>800){
  	$("whitebox").css("font-size","50px");
  
  }
  