gppro_css_inline_SECTION

Each section has a corresponding CSS building section. This filter (tied to each default section) allows you to add any custom data fields you may have created..

function my_css_footer_main( $css, $data, $class ) {
	if ( GP_Pro_Builder::build_check( $data, 'my-custom-data-key' ) )
		$css	.= $class.' .class-to-target { '.GP_Pro_Builder::text_css( 'text-decoration', $data['my-custom-data-key'] ).'}'."\n";

	// send it back
	return $css;
}
add_filter ( 'gppro_css_inline_footer_main', 'my_css_footer_main', 15, 3 );