View file wordpress/wp-includes/js/tinymce/plugins/wordpress/wordpress.css

.mce_plugin_wordpress_more {
	border: 0px;
	border-top: 1px dotted #cccccc;
	display:block;
	background-color: #ffffff;
	margin-top:15px;
	background-image: url(images/more_bug.gif);
	background-repeat: no-repeat;
	background-position: right top;
}

.mce_plugin_wordpress_page {
	border: 0px;
	border-top: 1px dotted #cccccc;
	display:block;
	background-color: #ffffff;
	margin-top:15px;
	background-image: url(images/page_bug.gif);
	background-repeat: no-repeat;
	background-position: right top;
}

/* This file contains the CSS data for the editable area(iframe) of TinyMCE */
/* You can extend this CSS by adding your own CSS file with the the content_css option */

body {
	background: #fff;
	font: 1em/1.3em Georgia, "Times New Roman", Times, serif;
	padding: .5em;
}

td {
	font-size: 10px;
}

pre {
	font-family: "Courier New", fixed;
	font-size: 11px;
	line-height: 13px;
}

.mceVisualAid {
	border: 1px dashed #BBBBBB !important;
}

.mceItemAnchor {
	width: 12px;
	line-height: 6px;
	overflow: hidden;
	padding-left: 12px;
	background-position: bottom;
	background-repeat: no-repeat;
}

/* Important is needed in Gecko browsers inorder to style links */
/*
a {
	color: green !important;
}
*/

/* Style selection range colors in Gecko browsers */
/*
::-moz-selection {
	background-color: red;
	color: green;
}
*/

/* MSIE specific */

* html body {
	scrollbar-3dlight-color: #F0F0EE;
	scrollbar-arrow-color: #676662;
	scrollbar-base-color: #F0F0EE;
	scrollbar-darkshadow-color: #DDDDDD;
	scrollbar-face-color: #E0E0DD;
	scrollbar-highlight-color: #F0F0EE;
	scrollbar-shadow-color: #F0F0EE;
	scrollbar-track-color: #F5F5F5;
}