diff --git a/EnvelopeGenerator.Web/wwwroot/js/app.js b/EnvelopeGenerator.Web/wwwroot/js/app.js
index 37a71451..fda1d49e 100644
--- a/EnvelopeGenerator.Web/wwwroot/js/app.js
+++ b/EnvelopeGenerator.Web/wwwroot/js/app.js
@@ -10,8 +10,8 @@ const ActionType = {
 }
 
 class App {
-    constructor(container, envelopeKey, envelopeReceiver, documentBytes, licenseKey) {
-        this.container = container
+    constructor(envelopeKey, envelopeReceiver, documentBytes, licenseKey, container) {
+        this.container = container ?? `#${this.constructor.name.toLowerCase()}`;
         this.envelopeKey = envelopeKey
 
         this.UI = new UI()