Container Background Image Class ID

Hi there,

The background image is achieved with CSS and not HTML so you cannot add a class to it.

Here is how the background-image CSS property work:
https://www.w3schools.com/cssref/pr_background-image.asp

so,

how to add css animation to the background image ONLY and NOT the whole container?

Please see check page URL on private information area.

I'm not aware of an out-of-box solution unfortunately - I'd assume that it would require a custom solution.