DevTools: tweak performance landing page style.

third_party/WebKit/Source/devtools/front_end/timeline/timelinePanel.css

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Anthony Ricaud <rik@webkit.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 636 matching lines @@
     white-space: nowrap;
 }
 
 .timeline-landing-page {
     position: absolute;
     background-color: white;
     justify-content: center;
     align-items: center;
     overflow: auto;
     font-size: 13px;
+    line-height: 15px;
     color: #777;
 }
 
 .timeline-landing-page > div {
-    width: 430px;
+    max-width: 430px;
+    margin: 10px;
 }
 
 .timeline-landing-page > div > p {
     flex: none;
 }
 
 .timeline-landing-warning {
-    border: 1px solid #fdd835;
     background-color: #fffde7;
-    padding: 5px;
+    padding: 10px 14px;
+    box-shadow: 1px 1px 3px rgba(0,0,0,0.2);
 }
 
 .timeline-landing-warning span[is=ui-icon] {
-    position: relative;
-    top:7px;
+    margin: -8px;
 }