add video attribution to OOBE demo

bug: 132702828
Change-Id: If072d99f66bcfc6a9e6bb66878cc4887b06d4f5e

edgetpudemo/index.html

diff --git a/edgetpudemo/index.html b/edgetpudemo/index.html
index d748a8d..8459d01 100644
--- a/edgetpudemo/index.html
+++ b/edgetpudemo/index.html
@@ -13,6 +13,13 @@
     .description {
       max-width: 960px; /* This matches the video width */
     }
+    #container {
+      height: 540px;
+    }
+    .footer {
+      font-size:0.7rem;
+      opacity:0.5;
+    }
   </style>
 </head>
 <body>
@@ -29,5 +36,9 @@
   </p>
   </div>
   <div id="container"></div>
+  <p class="footer">
+    Video source courtesy of <a target="_blank"
+      href="https://pixabay.com/videos/road-autobahn-motorway-highway-11018/">Pixabay</a>.
+  </p>
 </body>
 </html>