Reduce category image size on the home page

Hi there
Im using v3.9
I have uploaded my category images and am showing them on the home page. However it appears that once the images are uploaded and displayed on the home page they look stretched by the nopcommerce system.
is there a way to get the image displayed as the correct size? Rather than the ssytem stretching it?
Thanks!

i worked out that this is done in admin section under settings; media settings
hope it helps other newbies!!
/Admin/Setting/Media
Category thumbnail image size: set to 100 and it doesnt stretch it.

I think you need customize css class of picture in your theme, find class name as below in your theme and change default width you want.

.product-list .item-box .picture {
  float: left;
  width: 220px; /*changes to width as you want.*/
}

Hope it help you ^^