Simple button shortcode

button_shortcode.php

function tend_button( $atts, $content = null ) {
    extract(shortcode_atts(array(
    'link'	=> '#',
    'class'	=> 'turq',
    ), $atts));
 
	$out = '<a class="button ' .$class. '" href="' .$link. '">' .do_shortcode($content). '</a>';
    
    return $out;
}
add_shortcode('button', 'tend_button');

add_filter('widget_text', 'do_shortcode');