Add a background image to the shop page only in WooCommerce

Add a background image to the shop page only in WooCommerce

add_filter( 'wp_head', 'wo_custom_shop_background' );
function wo_custom_shop_background() {
 if( is_shop() && !is_admin() ) {
 ?>
 <style>
 body {
 background: url(http://blogs.smithsonianmag.com/smartnews/files/2013/08/06177001.jpg) no-repeat center center fixed; 
 -webkit-background-size: cover;
 -moz-background-size: cover;
 -o-background-size: cover;
 background-size: cover;
 }
 </style>
 <?php
 }
}