[DevTools] Pin the infobar to the top of the page

chrome/browser/resources/inspect/inspect.css

 /* Copyright (c) 2012 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. */
 
 * {
   box-sizing: border-box;
 }
 
 body {
   color: rgb(48, 57, 66);
@@ skipping 16 matching lines @@
 }
 
 #container {
   -webkit-flex-direction: row;
   display: -webkit-flex;
 }
 
 #infobar {
   background: rgb(255, 212, 0);
   height: 20px;
+  left: 0;
   line-height: 20px;
+  position: fixed;
+  right: 0;
   text-align: center;
   visibility: hidden;
+  z-index: 1;
 }
 
 #infobar.show {
   visibility: visible;
 }
 
 #navigation {
   padding-top: 20px;
   width: 150px;
 }
@@ skipping 381 matching lines @@
 @media (min-width: 47em) {
   #container {
     max-height: 100vh;
   }
   #navigation,
   #content {
     max-height: 100vh;
     overflow: auto;
   }
 }