Improve ChromeVox incremental search experience.

chrome/browser/resources/chromeos/chromevox/cvox2/background/panel.css

 /* Copyright 2016 The Chromium Authors. All rights reserved.
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 body {
   border: 0;
   height: 35px;
   margin: 0;
   overflow: hidden;
@@ skipping 61 matching lines @@
   width: 19px;
 }
 
 #close:hover {
   background-image: url(/images/close-hover-19.png);
 }
 
 #caption {
   color: #fff;
   flex-grow: 1;
-  margin-left: 12px;
+  margin: 0 12px;
 }
 
 #speech-container {
   height: 35px;
-  margin-left: 12px;
+  margin: 0 12px;
 }
 
 #speech {
   font-family: 'Roboto', sans-serif;
   font-size: 12pt;
   height: 35px;
   line-height: 35px;
   overflow: hidden;
 }
 
@@ skipping 18 matching lines @@
 }
 
 #braille-cells {
   font-family: 'Droid Sans Mono', Courier, monospace;
   font-size: 13pt;
   height: 17px;
   line-height: 17px;
   white-space: pre;
 }
 
+#search-container {
+  height: 35px;
+  margin: 0 12px;
+}
+
+#search {
+  background-color: #000;
+  border: 1px solid #fff;
+  color: #fff;
+  font-family: 'Roboto', sans-serif;
+  font-size: 12pt;
+  height: 35px;
+  line-height: 35px;
+  overflow: hidden;
+  width: 100%;
+}
+
 #menus_background {
   background-color: #eee;
   bottom: 0;
   left: 0;
   position: fixed;
   right: 0;
   top: 35px;
 }
 
 #menu-bar {
@@ skipping 61 matching lines @@
   margin: 0;
   padding: 0 18px;
 }
 
 .menu-item-shortcut {
   border: 0;
   margin: 0;
   padding: 0 18px 0 24px;
   text-align: right;
 }