Hello,
While it would be possible to create code that uses CSS layers through our Custom Code options, I do not believe that we offer any special support for layering content with CSS through our email creation tools. In addition, it is important to know that many email clients have very basic HTML renderers, and there are some that do not even fully support CSS 2, which heavily limits the capabilities of CSS in email.
Please let me know if you have any questions!
Sincerely,
Elijah G.
API Support Engineer
