title: Change "add to cart" button color based on Woocommerce product category
body: <p>In Woocommerce, I am trying to change the colour of the "Add to cart" button based on the product category that it is in. So far I am able to change the text, however I can't figure out how to pass in a persistant colour value in hash format (e.g. #fffff)</p>
  
  <pre><code>// Change add to cart button text per category
  add_filter( 'woocommerce_product_single_add_to_cart_text', 'wps_custom_cart_button_text' );
  function wps_custom_cart_button_text() {
      global $product;
      $terms = get_the_terms( $product-&gt;ID, 'product_cat' );
       foreach ($terms as $term) {
          $product_cat = $term-&gt;slug;
          break;
      }
      switch($product_cat) {
          case 'clothing';
          return __('Order your Clothes', 'your_theme_text_domain' );
          default;
          return __( 'Order now', 'your_theme_text_domain' );
      }
  }
  </code></pre>
  
  <p>Any help appreciated.</p>