Centering Page Images

You need to put those three images inside of some sort of container block, which can then be centered. As it stands, you just have three images and there’s no easy way to target them as a group with CSS.

They are in a block together, but they each have their own alignment.

No, they’re not.

See https://i.imgur.com/D3gBh4O.png

You can see what I meant about the blocks in this and this link. The first image shows the whole block selected, which contains all three images, and the second shows one of the images within the block selected.

Try using a grid block

https://www.ads-software.com/plugins/grid-block/