Adds keyboard access to the finish linking phone button

background.html

@@ -255,13 +255,13 @@
               <span class='banner-icon lead-pencil'></span>
               <div class='header'>{{ chooseName }}</div>
               <div>
-                <input type='text' class='device-name' spellcheck='false' maxlength='50' />
+                <input type='text' class='device-name' spellcheck='false' maxlength='50' tabIndex="0" />
               </div>
             </div>
 
               <div class='nav'>
                 <div>
-                  <a class='button finish'>{{ finishLinkingPhoneButton }}</a>
+                  <button class="button finish" type="submit" tabIndex="0">{{ finishLinkingPhoneButton }}</button>
                 </div>
               </div>
           </div>