CB Activity single post display

Ok there is no custom css that I can find.
Also single posts without video do display fine. cercle.business/flow/post/6834/lionne-shop

Could you try uploading a large video on your demo website and view it in a single post ?

I can trace the issue in CB Activity css default file but cannot find where it fails

CB Gallery for CB Activity is enabled on the demo site. You're welcome to give it a try there. I don't own an apple device. I've no means of really testing Safari outside of some cloud tools and I didn't see any issues in 2 snapshots from local tests so I'm not sure where it's coming from.

The only CSS really being applied to the video container is the aspect ratio. Below is the CSS being applied.

You can try toggling off the aspect-ratio style in your browsers developer tools to see if that resolves it. It should be working fine though as has been supported since Safari 15 since 2021.

Ran additional tests through playwright and still not seeing any issues. So I'm at a loss as to what is causing this for you. I don't see the issue on your site either using playwright. What version of Safari are you using? Our support policy is basically "latest 2" so latest 2 major releases of any major browser.

Am on Safari 17.2.1 also tested on Safari preview

Was able to find the issue which is the aspect ratio line 517 of the CB Activity template

.cb_template .streamMediaEmbed, .cb_template .streamMediaVideo {
    aspect-ratio: 16/9;
    font-size:0
}

I tried to override the setting in my css but seems not to be applied by Safari
The only solution is to change aspect-ratio: auto in the CB activity css default template

aspect-ratio should be working perfectly fine on Safari 17. It seams to work fine in my emulation and cloud snapshot tests. Is it also not working for you on our demo site? You have to keep in mind it's very easy for some styling rules to fight one another unexpectedly so using our demo site as a clean environment is an easy way to confirm it's coming from our CSS directly.

It looks like you've a custom CB template generated. Please try switching to default CB template and see if issue persists.

Wonder if it's an object-fit problem. I've no idea what the default is for Safari in that regard. You can try adding 1 of the following.

I haven't tested which would work best here, but that might fix it for Safari. Trying to find possible bug reports about aspect-ratio for Safari as well to see what could be going wrong.