fix iframe

package.json

 {
     "name": "react-ag-qeditor",
-    "version": "1.0.22",
+    "version": "1.0.23",
     "description": "WYSIWYG html editor",
     "author": "atma",
     "license": "MIT",

src/QEditor.jsx

@@ -513,7 +513,7 @@ const QEditor = ({
             case 'iframe_custom':
                 return (
                     <Fragment>
-                        <textarea cols={5} rows={5} value={embedContent} placeholder={'<iframe></iframe>'}
+                        <textarea style={{width: '100%', height: '100%'}} rows={18} value={embedContent} placeholder={'<iframe></iframe>'}
                                onInput={(e) => setEmbedContent(e.target.value)}
                         />
                     </Fragment>