eMail Stacks - "Floating" sidebar? (that works across most clients)

Is there any way to create a “floating” sidebar so that the main body text flows under it? Perhaps with custom CSS? And if so, does it work well in Outlook, etc??

Thanks in advance for replies.

Email clients do not support floating. Sorry.

I suspected as much but wanted to confirm as there are some sharp people here on the forum with some good tricks… Thanks.