diff --git a/dev/js/src/init.js b/dev/js/src/init.js
index 294a3c9..6b4ad67 100644
--- a/dev/js/src/init.js
+++ b/dev/js/src/init.js
@@ -141,6 +141,11 @@
       });
     };
 
+    document.getElementsByTagName('aside')[0].addEventListener('focus', function() {
+      this.classList.add('active')
+    });
+
+      
     // Replace QL select menus with KorAP menus
     var qlField = document.getElementById('ql-field');
     if (qlField !== null) {