DevTools: ui polish for the audits2 panel.

third_party/WebKit/Source/devtools/front_end/audits2/audits2Panel.css

 /*
  * Copyright 2017 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.
  */
 
 .toolbar {
     border-bottom: 1px solid #ccc;
 }
 
 .audits2-logo {
     width: 210px;
     height: 200px;
     flex-shrink: 0;
     background-repeat: no-repeat;
     background-size: contain;
     margin-top: 10px;
     background-image: url(Images/audits_logo.svg);
 }
 
 .audits2-landing-page {
     display: flex;
     align-items: center;
     justify-content: center;
+    overflow: auto;
 }
 
 
 .audits2-landing-center {
     display: flex;
     align-items: center;
     justify-content: center;
     max-width: 400px;
     margin: 50px;
 }
 
+.audits2-landing-center > * {
+    flex-shrink: 0;
+}
+
 .audits2-landing-text {
     color: #666;
 }
 
 .audits2-landing-bold-text {
     font-weight: bold;
 }
 
 .lh-root {
   --report-menu-width: 0 !important;
@@ skipping 63 matching lines @@
     width: calc(68px * 7);
 }
 
 .audits2-timeline-subtitle {
     color: #01579B;
 }
 
 .audits2-timeline-bar {
     border-top: 4px solid #03A9F4;
 }