diff --git a/data/telegram.org/js/telegram-web-app.js b/data/telegram.org/js/telegram-web-app.js
index 408b192d30..712fb3d4c8 100644
--- a/data/telegram.org/js/telegram-web-app.js
+++ b/data/telegram.org/js/telegram-web-app.js
@@ -9,7 +9,7 @@
 
   var initParams = urlParseHashParams(locationHash);
 
-  var isIframe = false;
+  var isIframe = false, iFrameStyle;
   try {
     isIframe = (window.parent != null && window != window.parent);
     if (isIframe) {
@@ -23,8 +23,17 @@
         if (!dataParsed || !dataParsed.eventType) {
           return;
         }
-        receiveEvent(dataParsed.eventType, dataParsed.eventData);
+        if (dataParsed.eventType == 'set_custom_style') {
+          iFrameStyle.innerHTML = dataParsed.eventData;
+        } else {
+          receiveEvent(dataParsed.eventType, dataParsed.eventData);
+        }
       });
+      iFrameStyle = document.createElement('style');
+      document.head.appendChild(iFrameStyle);
+      try {
+        window.parent.postMessage(JSON.stringify({eventType: 'iframe_ready'}), '*');
+      } catch (e) {}
     }
   } catch (e) {}
 
diff --git a/data/webappcontent.telegram.org/cafe.html b/data/webappcontent.telegram.org/cafe.html
index b150487d3e..b2d82d2e62 100644
--- a/data/webappcontent.telegram.org/cafe.html
+++ b/data/webappcontent.telegram.org/cafe.html
@@ -9,7 +9,7 @@
     <meta name="MobileOptimized" content="176" />
     <meta name="HandheldFriendly" content="True" />
     <meta name="robots" content="noindex, nofollow" />
-    <script src="https://tg.dev/js/telegram-web-app.js?1"></script>
+    <script src="https://tg.dev/js/telegram-web-app.js?2"></script>
     <script>
       function setThemeClass() {
         document.documentElement.className = Telegram.WebApp.colorScheme;
diff --git a/data/webappcontent.telegram.org/demo.html b/data/webappcontent.telegram.org/demo.html
index aeb1b5b229..9672242e5a 100644
--- a/data/webappcontent.telegram.org/demo.html
+++ b/data/webappcontent.telegram.org/demo.html
@@ -8,7 +8,7 @@
     <meta name="MobileOptimized" content="176" />
     <meta name="HandheldFriendly" content="True" />
     <meta name="robots" content="noindex,nofollow" />
-    <script src="https://telegram.org/js/telegram-web-app.js?1"></script>
+    <script src="https://telegram.org/js/telegram-web-app.js?2"></script>
     <script>
       function setThemeClass() {
         document.documentElement.className = Telegram.WebApp.colorScheme;