Merge pull request #60 from jerolba/patch-1

document.body.toggleClass is not a function

src/js/plugins/grid.js

@@ -38,7 +38,7 @@ export default class Grid {
    */
   onKeyPress_(event) {
     if (event.which === Keys.ENTER) {
-      document.body.toggleClass('baseline');
+      document.body.classList.toggle('baseline');
     }
   }
 }