They are divs within a container. If you have a look on the ‘partners page’, under any view smaller than desktop, you will see that they sit to the left of the screen rather than centered within the container.
Thanks for the suggestion. I tried that but it would then stack them all on top of each other. They were centered, which is a start, but there was room next to it for another box.
Just to confirm that we get same result here. This is what I got. If this is not what you trying to achieve, can you please describe it in more detail what it is.