Added placeholder and fixed clanker button error

index.html

@@ -15,16 +15,16 @@
         <br><br>
         <div id="viewer">
             <div id="screen">
-                
+                <img src="img/placeholder.jpg" width="1280" height="720">
             </div>
-            <div>
+            <div id="sidePanel">
                 <div id="controls">
-                    <button onclick="pressButton('up')">Up</button>
-                    <button onclick="pressButton('down')">Down</button>
-                    <button onclick="pressButton('left')">Left</button>
-                    <button onclick="pressButton('right')">Right</button>
-                    <button onclick="pressButton('select')">Select</button>
-                    <button onclick="pressButton('back')">Back</button>
+                    <button onclick="pressButton('up')">Up</button><br>
+                    <button onclick="pressButton('down')">Down</button><br>
+                    <button onclick="pressButton('left')">Left</button><br>
+                    <button onclick="pressButton('right')">Right</button><br>
+                    <button onclick="pressButton('select')">Select</button><br>
+                    <button onclick="pressButton('menu')">Menu</button>
                 </div>
             </div>
         </div>