Product block rounded corners

Hello. How can I get my product blocks to have rounded corners. The product blocks are in the "New Arrival" section. My website is https://chrysalis-dog-f4na.squarespace.com/ password is 1234 

If you add the following to Custom CSS, it should add a border radius to all images. This can save you time changing all images one by one. Adjust the number to your preference.

img {
  border-radius: 25px;
}

If you want to just target the Products themselves, use the following within Custom CSS.

div.products img {
  border-radius: 25px !important;
}

The first code worked and changed all the images in the site. The second didn't work for the product block. I'm looking to change the product block only