default void setStyle( String style ) {
		putClientProperty( FlatClientProperties.STYLE, style );
	}
Specifies the style of a component as String in CSS syntax ("key1: value1; key2: value2; ...").
<p>
The keys are the same as used in UI defaults, but without component type prefix.
E.g. for UI default {@code Slider.thumbSize} use key {@code thumbSize}.
<p>
The syntax of the CSS values is the same as used in FlatLaf properties files
(<a href="https://www.formdev.com/flatlaf/properties-files/">https://www.formdev.com/flatlaf/properties-files/</a>),
but some features are not supported (e.g. variables).

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