**Issue:**

I’m unable to apply custom CSS for background gradients and sticky header effects on my Voxel site (thevietnamedit.com).

1. What is the correct selector for the main header element in Voxel? Like this: https://gamerank.27collective.net/
2. How do I prevent Elementor sections from blocking the body background gradient?
3. Is there a Voxel-specific setting for sticky headers I should use instead of CSS?
4. Do I need to enable sticky header functionality in Voxel settings first?

Thanks for your help.