Hello,
Unless we're mistaken, you're not using the HikaShop frontend template at all, and so you have to know that responsive commands are in HikaShop frontend css file.
Now, on this specific case you can unset the container div with this kind of command :
div#hikashop_image_main_thumb_div {
height: unset !important;
}
And, in order to restrict this command only when it's required here phone screen
@media only screen and (max-width: 600px) {
div#hikashop_image_main_thumb_div {
height: unset !important;
}
}
Here, the "
600px" value is just an example, define where it fits your needs.
Learn more about the "
@media" command,
here
.
Regards
Team HikaShop