sale icon on image product list black&white theme

[predot]

Hi,

I am not expert in prestashop and website designer.

I am trying to insert the icon sale on my product list page (product-list.tpl).

using following code :

{if $product.on_sale}<img src="{$img_dir}onsale_{$lang_iso}.gif" alt="{l s='On sale'}" class="on_sale_img"/>{/if}

 

it's works but there is an issue that the image is fill all the thumbnail product, and the price and title is moving down.

 

how to resolve this...?

sorry for my english

 

thank you for all of your support and help