diff --git a/static/index.html b/static/index.html
index 5d61994..d1595c7 100644
--- a/static/index.html
+++ b/static/index.html
@@ -14,7 +14,7 @@
 <label>Use this markup in your HTML: <input id="result" placeholder="result will go here">
 <br>
 <h4>Preview</h4>
-<iframe width="400" height="800" id="frame" sandbox src=""></iframe>
+<iframe width="0" height="0" id="frame" sandbox="allow-top-navigation" src=""></iframe>
 <script>
 function genUrl(){
 	function val(id){