src/main/resources/org/apache/struts2/static/dojo/src/widget/templates/Validate.css

.dojoValidateEmpty{
	background-color: #00FFFF;
}
.dojoValidateValid{
	background-color: #cfc;
}
.dojoValidateInvalid{
	background-color: #fcc;
}
.dojoValidateRange{
	background-color: #ccf;
}