Custom item box

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

	// Attributes
	extract( shortcode_atts(
		array(
			'class' => '',
		), $atts )
	);

	// Code
ob_start();
?>
<span class="item_box, <?php echo esc_attr($atts['class']); ?>">
<?php do_shortcode($content); ?>
</span>
<?php
return ob_get_clean();
}
add_shortcode( 'item_box', 'custom_shortcode_item_box' );