Cuttlefish WebRTC | Update look/feel for launcher

 - Update the background-color for the main launcher page for WebRTC
 - Update the video element size to be 540 x 1080 (50% size increase)

BUG: 147389116
FIXES: 147389116
Change-Id: I36a30fb7596d35caad293fcbeaf1e21c4f4f3e88
Test: Build / launch and interact with the virtual instance
diff --git a/host/frontend/gcastv2/webrtc/assets/index.html b/host/frontend/gcastv2/webrtc/assets/index.html
index fe4cb3c..69995fc 100644
--- a/host/frontend/gcastv2/webrtc/assets/index.html
+++ b/host/frontend/gcastv2/webrtc/assets/index.html
@@ -1,6 +1,6 @@
 <html>
     <head>
-        <title>My WebRTC Playground</title>
+        <title>My Virtual Device Playground</title>
 
         <link rel="stylesheet" type="text/css" href="style.css" >
     </head>
@@ -10,7 +10,7 @@
         <hr>
         <section class="noscroll">
             <div class="one" >
-                <video id="video" autoplay controls width="360" height="720" style="touch-action:none" ></video>
+                <video id="video" autoplay width="540" height="1080" style="touch-action:none" ></video>
             </div>
 
             <div class="two" >