Help needed with a HTML Block not displaying correctly

Hi Community,

I am trying to add a HTML block to display 3 images (one nest to the other, no space between them or padding). And need them to display the same on mobile and desktop.

I converted my code into XHTML and pasted it in the block. The images appear now one on top of the other in the builder and when I send a test email they won’t display at all. Can anyone help? the XHTML code is below