Equal image heights?

Hi.
Tried with CSS to get equal image heights but cannot get it to work. Is there a ready CSS style for that?
( Tested below )
img.attachment-woocommerce_thumbnail.size-woocommerce_thumbnail {
width: 100%;
}
.vi-wcuf-us-product img {
height: 100px!important;
object-fit: cover;
}

When using checkbox design is there a way to remove quantiy option and just have the checkbox like in the free version? So you can check and uncheck it without the product being removed from the offer list.

Kind regards