Woocommerce image resize problem

Hello guys, I am actually looking to solve this problem for a couple of days and just nothing works really.. I hope you can help me out, I have a webshop with all kinds of products and I want the images to scale to a certain resolution (like max-x150 and y depending on the image) I did have this working past Friday, but I have no idea what went wrong. This is the code I already implemented in my additional css (partly from other topics)

ul.products .count {display:none;}ul.products li.product a img {max-width:150; max-height:180;}.related ul.products li.product img, .related ul li.product img, .upsells.products ul.products li.product img, .upsells.products ul li.product img {max-width:150; max-height:180;}.single-product.layout-full .images img {width: 150px; height: 180;}

None of this code really works, it just changes nothing actually. I am not looking to hardcrop the images I am looking to scale them to a certain maximum resolution.

My current image settings are:Catalog images – W 150 H 180Single product image – W 150 H 180Product thumbnails – W 150 H 180

Thanks in advantage!