WebUI TaskManager: small UI fixes

chrome/browser/resources/task_manager/task_manager.css

 /*
  * Copyright (c) 2011 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.
  */
 
 * {
   margin: 0;
   padding: 0;
 }
 
+html {
+  overflow: hidden;
+}
+
 /* Outer frame of the dialog. */
 body {
   -webkit-box-orient: vertical;
   -webkit-user-select: none;
   display: -webkit-box;
   font-family: segoe ui, arial, helvetica, sans-serif;
   font-size: 12px;
   height: 100%;
   min-height: 150px;
   position: absolute;
@@ skipping 11 matching lines @@
   margin-bottom: 4px;
   padding: 0px 12px 4px 12px;
 }
 
 /* Container for the detail list views. */
 .dialog-body {
   -webkit-box-flex: 1;
   border: 1px #aaa solid;
   border-radius: 3px;
   display: -webkit-box;
-  margin: 4px;
+  margin: 4px 4px 2px;
 }
 
 /* Column text containers. */
 .list-container {
   -webkit-box-flex: 1;
   display: -webkit-box;
 }
 
 /* Table splitter element */
 .table-header-splitter {
@@ skipping 78 matching lines @@
   display: -webkit-box;
 }
 /* cr.ui.Table has a black focus border by default, which we don't want. */
 .detail-table:focus {
   border: 0;
 }
 
 /* Container for footer area. */
 .dialog-footer {
   display: -webkit-box;
-  margin: 4px;
+  margin: 2px 4px 4px;
 }
 
 /* Container for the ok/cancel buttons. */
 .footer-left-container {
   -webkit-box-align: center;
   -webkit-box-flex: 1;
   display: -webkit-box;
   text-align: left;
 }
 
 #about-memory-link {
   padding-left: 2px;
   color: #1155CC;
 }
 
 /* Container for the ok/cancel buttons. */
 .footer-right-container {
   -webkit-box-flex: 1;
   text-align: right;
 }
 
 button {
   margin: 2px 0 2px 8px;
-  padding: 1px 6px;
 }