Using classic editor; can't put images side by side

Hi there!

I went through the hassle of using the classic editor in order to use image blocks in Poster mode so that I can apply CSS to make them flip (see this tutorial: https://www.will-myers.com/articles/image-block-flip-effect-for-poster-images-in-squarespace)... For some reason, I got all 4 images to work, but I cannot for the life of me resize them so that they are lined up 4 in a row, side by side, instead of vertically stacked. Please help! Any ideas?

Website password: 1234

P.S- I've already tried adding a spacer block, and it also only inserts vertically.

Thank you!!!

With the classic editor, you need to drag-and-drop the images next to each other, the blue lines are guides for where the image will get inserted.

Thank you for the response! When I do that, the images themselves get tiny, and the text is still massive.... Here is a screenshot: 

Can you share your website URL?

Looks like you have a problem with the content width being very narrow, is that on purpose?