changed elevator button

blog.html

@@ -28,7 +28,7 @@ layout: default
 </div>
 {% endfor %}
 
-<div class="elevator-button" style="text-align: center; margin: auto; cursor: pointer;">Back to Top</div>
+<div class="elevator-button"><i class="fa fa-arrow-up"></i></div>
 <script src="js/elevator.min.js"></script>
 <script>
 // Elevator script: https://github.com/tholman/elevator.js
@@ -40,4 +40,4 @@ window.onload = function() {
     duration: 20000 // milliseconds
   });
 }
-</script>
+</script>