public function get_button_style() {
		/**
		 * Filters the default email button CSS rules
		 *
		 * @since 3.8.0
		 *
		 * @param array $email_button_css Associative array of the type css-property => definition.
		 */
		$rules  = apply_filters(
			'llms_email_button_css',
			array(
				'background-color' => $this->get_css( 'button-background-color', false ),
				'color'            => $this->get_css( 'button-font-color', false ),
				'display'          => 'inline-block',
				'padding'          => '10px 15px',
				'text-decoration'  => 'none',
			)
		);
		$styles = '';
		foreach ( $rules as $rule => $style ) {
			$styles .= sprintf( '%1$s:%2$s !important;', $rule, $style );
		}
		return $styles;
	}