public function get_rgba_css() {

		$colors = array();

		foreach ( $this->colors as $name => $args ) {

			if ( ! empty( $name ) && ! empty( $args['rgba_css'] ) && is_array( $args['rgba_css'] ) ) {

				$colors[ $name ] = $args['rgba_css'];

			}

		}

		return $colors;

	}