$(document).ready(function(){

      $('.learn-more-bt,.contact-bt,.view-work-bt').append('<span class="hover"></span>').each(function () {
          var $span = $('> span.hover', this).css('opacity', 0);
          $(this).hover(function () {
            $span.stop().fadeTo(500, 1);
        }, function () {
        	$span.stop().fadeTo(500, 0);
        });
      });
  
  });