Issue 3895 - Fix size of dialog close buttons on the options page

skin/options.css

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 1182 matching lines @@
   color: #0F660F;
   display: inline-block;
   height: 20px;
   font-size: 15px;
   -moz-padding-start: 10px;
   -webkit-padding-start: 10px;
 }
 
 #dialog-close::before
 {
-  background-position: -9px -32px;

[Thomas Greiner, 2016/04/07 17:40:11]

Detail: These coordinates should be `-10px -33px` because there's a 1px space
between each of the icons in the sprite.

+  background-position: -10px -33px;
   content: "";
   cursor: pointer;
-  height: 10px;

[Thomas Greiner, 2016/04/07 17:40:11]

Detail: Actually, the "close" button in the sprite is 8x8 pixels.

-  width: 10px;
+  height: 8px;
+  width: 8px;
   vertical-align: middle;
   -moz-margin-end: 6px;
   -webkit-margin-end: 6px;
 }
 
 #dialog #dialog-body
 {
   margin: 4px 24px;
 }
 
@@ skipping 104 matching lines @@
 #other-language .button-add::before
 {
   display: none;
 }
 
 #other-language .display
 {
   -webkit-margin-start: 10px;
   -moz-margin-start: 10px;
 }