Merge pull request #2220 from marko-bekhta/fix/center-back-to-top

Center the icon in the "back-to-the-top" box

Author: yrodiere

_sass/includes/back-to-top.scss

@@ -16,6 +16,7 @@
 
   i {
     margin-top: .5rem;
+    padding: 0;
   }
 }
 #backToTop:hover {