DevTools: beautified styles sidebar toolbar.

third_party/WebKit/Source/devtools/front_end/ui/toolbar.css

 /*
  * Copyright (c) 2014 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.
  */
 
 :host {
     flex: none;
     padding: 0 2px;
 }
@@ skipping 33 matching lines @@
     padding: 0;
     height: 26px;
     border: none;
     color: #5a5a5a;
 }
 
 .toolbar-dropdown-arrow {
     -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
     -webkit-mask-size: 352px 168px;
     -webkit-mask-position: -18px -96px;
-    background-color: #444;
+    background-color: #6D6D6D;
     width: 12px;
     height: 12px;
     display: inline-block;
     pointer-events: none;
     margin: auto 0;
 }
 
 @media (-webkit-min-device-pixel-ratio: 1.5) {
     .toolbar-dropdown-arrow {
         -webkit-mask-image: url(Images/toolbarButtonGlyphs_2x.png);
     }
 } /* media */
 
-/* Text-glyph item */
+/* Toolbar item */
 
-.toolbar-text-glyph {
+.toolbar-button {
     white-space: nowrap;
     overflow: hidden;
     min-width: 28px;
     background: transparent;
 }
 
 .toolbar-text {
     margin: 0 5px;
     flex: none;
     color: #5a5a5a;
 }
 
 .toolbar-has-dropdown .toolbar-text {
     margin-right: 1px;
 }
 
 .toolbar-has-glyph .toolbar-text {
     margin-left: 0;
 }
 
-.toolbar-bold .toolbar-text {
+.toolbar-button:not(.toolbar-has-glyph):not(.toolbar-has-dropdown):not(.menu-toolbar-item) {
     font-weight: bold;
 }
 
+.toolbar-button:not(.toolbar-has-glyph).hover {
+    background-color: #f3f3f3;
+}
+
 .toolbar-dimmed .toolbar-text {
     color: #999;
 }
 
 .toolbar-dimmed .toolbar-dropdown-arrow {
     background-color: #999;
 }
 
 .toolbar-glyph {
     -webkit-mask-image: url(Images/toolbarButtonGlyphs.png);
@@ skipping 348 matching lines @@
 .toolbar-state-active .filter-toolbar-item.toolbar-glyph,
 .toolbar-state-active .block-toolbar-item.toolbar-glyph {
     background-color: rgb(216, 0, 0) !important;
 }
 
 :host-context(.-theme-with-dark-background) .toolbar-state-active .filter-toolbar-item.toolbar-glyph,
 :host-context(.-theme-with-dark-background) .toolbar-state-active .block-toolbar-item.toolbar-glyph,
 :host-context(.-theme-with-dark-background) .toolbar-state-on .record-toolbar-item.toolbar-glyph {
     background-color: hsl(0, 100%, 65%) !important;
 }