WordPress/wp-includes/js/thickbox/thickbox.css

#TB_overlay {
	background: #000;
	opacity: 0.7;
	filter: alpha(opacity=70);
	position: fixed;
	top: 0;
	right: 0;
	bottom: 0;
	left: 0;
	z-index: 100050; /* Above DFW. */
}

#TB_window {
	position: fixed;
	background: #fff;
	z-index: 100050; /* Above DFW. */
	visibility: hidden;
	text-align: left;
	top: 50%;
	left: 50%;
	-webkit-box-shadow: 0 3px 6px rgba( 0, 0, 0, 0.3 );
	box-shadow: 0 3px 6px rgba( 0, 0, 0, 0.3 );
}

#TB_window img#TB_Image {
	display: block;
	margin: 15px 0 0 15px;
	border-right: 1px solid #ccc;
	border-bottom: 1px solid #ccc;
	border-top: 1px solid #666;
	border-left: 1px solid #666;
}

#TB_caption{
	height: 25px;
	padding: 7px 30px 10px 25px;
	float: left;
}

#TB_closeWindow {
	height: 25px;
	padding: 11px 25px 10px 0;
	float: right;
}

#TB_closeAjaxWindow {
	float: right;
}

#TB_closeAjaxWindow a {
	text-decoration: none;
}

#TB_ajaxWindowTitle {
	float: left;
	font-weight: 600;
	line-height: 29px;
	overflow: hidden; 
	padding: 0 29px 0 10px;
	text-overflow: ellipsis;
	white-space: nowrap;
	width: calc( 100% - 39px );
}

#TB_title {
	background: #fcfcfc;
	border-bottom: 1px solid #dfdfdf;
	height: 29px;
}

#TB_ajaxContent {
	clear: both;
	padding: 2px 15px 15px 15px;
	overflow: auto;
	text-align: left;
	line-height: 1.4em;
}

#TB_ajaxContent.TB_modal {
	padding: 15px;
}

#TB_ajaxContent p {
	padding: 5px 0px 5px 0px;
}

#TB_load {
	position: fixed;
	display: none;
	z-index: 103;
	top: 50%;
	left: 50%;
	background-color: #E8E8E8;
	border: 1px solid #555;
	margin: -45px 0 0 -125px;
	padding: 40px 15px 15px;
}

#TB_HideSelect {
	z-index: 99;
	position: fixed;
	top: 0;
	left: 0;
	background-color: #fff;
	border: none;
	filter: alpha(opacity=0);
	opacity: 0;
	height: 100%;
	width: 100%;
}

#TB_iframeContent {
	clear: both;
	border: none;
}

.tb-close-icon {
	color: #666;
	text-align: center;
	line-height: 29px;
	width: 29px;
	height: 29px;
	position: absolute;
	top: 0;
	right: 0;
}

.tb-close-icon:before {
	content: '\f158';
	font: normal 20px/29px 'dashicons';
	speak: none;
	-webkit-font-smoothing: antialiased;
	-moz-osx-font-smoothing: grayscale;
}

.tb-close-icon:hover {
	color: #00a0d2;
}