How can I decrease the horizontal and vertical gap between each picture in multicolumn section? 

Can I ask 1 more question? How can I decrease the horizontal and vertical gap between each picture?

It's work. Thank you so much!

Hello, I have a problem to solve. I want to edit the rounded corner for images in the multicolumn section for the Dawn theme. And I would like to decrease the horizontal and vertical gap of each picture. My website: https://forentino.com/