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// Button shortcode
add_shortcode('button', 'icad_button');
function icad_button($atts, $content = null) {
   extract(shortcode_atts(array('link' => '#'), $atts));
   return '<a class="btn_icad" href="'.$link.'">' . do_shortcode($content) . '<span class="btn_after"></span></a>';
}