Alloy’s blog is not designed to be a product catalog. It is built as a blogging tool. Its blog posts are specifically focused on blogging and isn’t designed or promoted to be anything but as blogging solution. I am sorry if somehow I gave the impression that the blog posts in Alloy were meant as anything but a blogging tool.
Can you “pad” you images with whitespace/background so the images are wider than taller? Either 4x3 or 16x9? You’d have to do this in an image editor before bringing the images in. How well it would work depends on what your images are of, but you may find Alloy is not the best tool for a catalog.
I’d need to better understand what you’re trying to do, how often you need to add/remove items, etc. The solution doesn’t have to be Foundry specific. You’d be better off posting on the Realmac forum, as you’ll reach more users.
The width issue never bothered me enough to try to change it (though it does). It just now occurred to me that I could use an image editor to give the image itself the padding that I wanted and make the padding area the same color as the web page. I don’t know if that would work or not.
OK, that’s a picture. Not much help is trying to work with you.
When asking for help with something, expecially if you want to step outside the way the stack you are using was meant to be used (as I think is the case here), you need to provide a link to the live site. Without this, it’s impossible to help.
Then as I say, it’s impossible to help. The site is published surely? Else, you won’t be able to add items to Alloy?
I appreciate you may not want to share the link, but that means help is going to be limited, if not, non-existent: You just can’t work on stuff like this without a live site.
EDIT: Shooting in the dark here, but try this bit of custom css. Bear in mind doing stuff like this “breaks” the stack it’s applied to, normally isn’t supported by devs and may have implications not expected in certain circumstances.