input[type=color] should look like a button

Source/core/css/html.css

 /*
  * The default style sheet used to render HTML.
  *
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 775 matching lines @@
 
 input[type="radio"] {
     -webkit-appearance: radio;
     box-sizing: border-box;
 }
 
 input[type="color"] {
     -webkit-appearance: square-button;
     width: 44px;
     height: 23px;
+    background-color: ButtonFace;
+    /* Same as native_theme_base. */
+    border: 1px #a9a9a9 solid;
+    padding: 1px 2px;
 }
 
 input[type="color"]::-webkit-color-swatch-wrapper {
     display:flex;
     padding: 4px 2px;
     box-sizing: border-box;
     -webkit-user-modify: read-only !important;
     width: 100%;
     height: 100%
 }
@@ skipping 359 matching lines @@
 @page {
     /* FIXME: Define the right default values for page properties. */
     size: auto;
     margin: auto;
     padding: 0px;
     border-width: 0px;
 }
 
 /* noscript is handled internally, as it depends on settings. */