link button

// Add Shortcode
function button( $atts , $content = null ) {

	// Attributes
	$atts = shortcode_atts(
		array(
			'url' => '/',
			'theme' => '',
		),
		$atts
	);

	// return HTML
	return '<a class="button button-' . $atts['theme'] . '" href="' . $atts['url'] . '">' . $content . '</a>';

}
add_shortcode( 'button', 'button' );