silverstripe-cms/css/WidgetAreaEditor.css

div.availableWidgetsHolder,
div.usedWidgetsHolder {
	width: 49%;
}

div.availableWidgetsHolder {
	float: left;
}

div.usedWidgetsHolder {
	float: right;
}

div.usedWidgets {
	border: 1px #CCC dotted;
	padding: 5px;
}
.NoWidgets {
	padding: 50px; /* Make this nice and big and easily 'droppable' */
}

div.usedWidgets div.Widget,
div.availableWidgets div.Widget {
	width: 98%;
	border: 1px solid #ddd;
	border-top: none;
	margin-bottom: 5px;
}
div.widgetDescription p,
div.widgetFields {
	padding: 0 8px;
	color: #666;
	font-size: 11px;
}

p.deleteWidget {
	margin: 0;
	height: 22px;
	line-height: 2.2;
	font-size: 12px;
}
span.widgetDelete {
	padding-left: 20px;
	margin-right: 8px;
	float: right;
	background: url(../images/delete.gif) no-repeat left center;
	cursor: pointer;
}
div.usedWidgets div.Widget h3,
div.availableWidgets div.Widget h3 {
	font-size: 12px;
	color: #fff;
	line-height: 1.8;
	text-indent: 5px;
	background: #000 url(../images/textures/obar-18.gif);
	margin: 0;
	cursor: move;
}