default String getStyle() {
		return (String) getClientProperty( FlatClientProperties.STYLE );
	}
Returns the style of a component as String in CSS syntax ("key1: value1; key2: value2; ...")
or {@code null} if no style has been assigned.

@see FlatClientProperties#STYLE
flatlaf-extras/src/main/java/com/formdev/flatlaf/extras/components/FlatStyleableComponent.java