vaadin-framework/src/com/itmill/toolkit/terminal/gwt/public/default/caption/caption.css

.i-errorindicator {
	width: 10px;
	height: 10px;
	display: block;
	float:left;
	background: #f00;
}

.i-error {
	padding-left: 15px;
	background: #fff;
	border: 1px solid red;
}