WordPress/wp-includes/js/tinymce/themes/advanced/skins/wp_theme/content.css

/* default styles */
body {background:#FFF;}
body.mceForceColors {background:#FFF; color:#000;}
h1 {font-size: 2em}
h2 {font-size: 1.5em}
h3 {font-size: 1.17em}
h4 {font-size: 1em}
h5 {font-size: .83em}
h6 {font-size: .75em}
.mceItemTable, .mceItemTable td, .mceItemTable th, .mceItemTable caption, .mceItemVisualAid {border: 1px dashed #BBB;}
a.mceItemAnchor {width:12px; line-height:6px; overflow:hidden; padding-left:12px; background:url(../default/img/items.gif) no-repeat bottom left;}
img.mceItemAnchor {width:12px; height:12px; background:url(../default/img/items.gif) no-repeat;}
img {border:0;}
table {cursor:default}
table td, table th {cursor:text}
ins {border-bottom:1px solid green; text-decoration: none; color:green}
del {color:red; text-decoration:line-through}
cite {border-bottom:1px dashed blue}
acronym {border-bottom:1px dotted #CCC; cursor:help}
abbr, html\:abbr {border-bottom:1px dashed #CCC; cursor:help}

/* WordPress styles */
html {
	background-color: #fff;
}

.aligncenter,
dl.aligncenter {
	display: block;
	margin-left: auto;
	margin-right: auto;
}

.alignleft {
	float: left;
}

.alignright {
	float: right;
}

.wp-caption {
	border: 1px solid #ddd;
	text-align: center;
	background-color: #f3f3f3;
	padding-top: 4px;
	margin: 10px;
	-moz-border-radius: 3px;
	-khtml-border-radius: 3px;
	-webkit-border-radius: 3px;
	border-radius: 3px;
}

.wp-caption img {
	margin: 0;
	padding: 0;
	border: 0 none;
}

.wp-caption-dd {
	font-size: 11px;
	line-height: 17px;
	padding: 0 4px 5px;
	margin: 0;
}

body.mceContentBody {
	font: 13px/19px Georgia, "Times New Roman", "Bitstream Charter", Times, serif;
	padding: 0.6em;
	margin: 0;
}

pre {
	font: 12px/18px Consolas, Monaco, "Courier New", Courier, monospace;
}

td {
	color: #000;
	font-size: 11px;
	margin: 8px;
}

.mceIEcenter {
	text-align: center;
}