How to align 3 images in a row?

Hello I am trying to put three pictures in a row together side by side (no space) but every time I try to do it when I zoom in and out it gets damaged. I think I’m doing it wrong for this theme. Please see the homepage of https://poudreheritage.dreamhosters.com/ and see the iamges with the woman repeated three times in a row. How do I create a simple gallery of 3 images side by side no space. Everything I try looks wrong. Thank you.