Remove space between pictures in collections section

Store Design
10

Hi. I want to have a seemless look betweeen my photos, same as this:

https://www.ulefone.com/armor-x13.html

Today it looks like this:

https://qmo6k09ve7qrr1yp-40562163873.shopifypreview.com/collections/armor-x-series/products/copy-of-ulefone-armor-x13

What do I need to do?