Long gap between photo and description

Gahh I give up! I'm sorry if this is answered somewhere already.. its so simple and I feel like I should know but I just can't seem to find the file I need to edit.

I used Firebug to see that the issue is this..
<div class="hikashop_product_main_image" style="height:420px;text-align:center;clear:both;">

WHERE do I go to change this?? I've checked the views, the template files, the css.. Its html but WHERE do I find this file to remove the height?


-- url of the page with the problem -- : atozalpacas.com/index.php/sale/product/1...nd-roving-table-sale
-- HikaShop version -- : Business
-- Joomla version -- : 2.5
-- PHP version -- : Not sure??
-- Browser(s) name and version -- : Chrome and Firefox (both up to date)
-- Error-message(debug-mod must be tuned on) -- : Error_message ??

Thank-you!!

Edit.. I'm so sorry, I just realized that I put this in the wrong section..

Hi,
Instead of removing the CSS height property, you should probably use some CSS code like :

.hikashop_product_main_image {
height: 265px!important;
}

Thank-you.. which css file do I change?