I'm not currently playing or implementing this mod. But I have had issues before with certain things that are placed via CSS not showing layers in the correct order. I believe this has something to do with default settings on the z-index. For example if you don't set the z-index on an object explicity, then your browser might just decide that forms or certain other objects are important enough to be on top and thus puts them there.
Just a suggestion of something to play with to see if you can get around it, only because I've had issues with other objects similar to this in the past. I might be way off base.
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