[bug] fix

src/logic/twitter.js

@@ -99,11 +99,11 @@ export function showGiveDialogHandler(userInfo) {
 }
 
 export function showIframeHandler() {
-    dom.iframe.style.display = 'block';
+    document.getElementById('iframe-content').style.display = 'block';
 }
 
 export function hideIframeHandler() {
-    dom.iframe.style.display = 'none';
+    document.getElementById('iframe-content').style.display = 'none';
 }
 
 /**