initial page generation

index.html

@@ -26,7 +26,8 @@
         <input type="number" id="steps" min="10" /><br>
         <button id="generate">Generate!</button>
         <p id="len"></p>
-        <div id="output"></div>
+        <div id="output" style="display: none;"></div>
+	<iframe id="pdf" style="width:100%;height:1000px"></iframe>
         <script src="src/main.js" lang="js" type="module"></script>
     </body>
 </html>