Topography Black. image gallery { display: flex; flex wrap: wrap; padding: 5px; } . image gallery img { flex: 1 1 33%; * default to three images per row * max width: 33%; padding: 5px; box sizing: border box; border radius: 15px; } @media (max width: 768px) { . image gallery img { flex: 1 1 50%; * two images per row for tablets * max width: 50%; } } @media (max width: 480px) { . image gallery img { flex: 1 1 100%; * one image per row for mobile * max width: 100%; } }