diff --git a/firmware/data/index_template_bottom.html b/firmware/data/index_template_bottom.html
index baeab8c..32db70c 100644
--- a/firmware/data/index_template_bottom.html
+++ b/firmware/data/index_template_bottom.html
@@ -242,7 +242,7 @@ xhr.open('GET', 'http://{{IP_ADDRESS}}/?on' + id + '=true&transition=' + documen
 
 xhr.send();
 updateLightState();
-this.classList.remove('pure-button-primary');
+this.classList.add('pure-button-primary');
 document.getElementById('on'+id+'_off').classList.remove('pure-button-primary');
 });
 });
diff --git a/firmware/html/index_template_bottom.html b/firmware/html/index_template_bottom.html
index 8fb77bc..e2c534a 100644
--- a/firmware/html/index_template_bottom.html
+++ b/firmware/html/index_template_bottom.html
@@ -242,7 +242,7 @@
                 // Sende die Anfrage im Hintergrund
                 xhr.send();
                 updateLightState();
-                this.classList.remove('pure-button-primary');
+                this.classList.add('pure-button-primary');
                 document.getElementById('on'+id+'_off').classList.remove('pure-button-primary');
             });
         });