The z-index is one of the Effects options for icons.
Does the z-index also affect adjacent room tiles? Or is it only within the 1 room. I'm using this as a hallway/door between 2 rooms. Without touching the z-index It looks fine in one room but is overlaid by the other room. I've used up both icon effects because I needed to rotate the icon 90deg (default effect) and change it's color to match the background (custom effect E31). I've added the z-index element to the E31 class as a test but it didn't make a difference, should that work? It's still obscured by the adjacent room and I need to know if that should work or not so I don't go chasing my tail. 
Thanks!
From my own experimentation the z-index applies for the objects within the room*. To raise or lower the whole tile you must add some CSS. The Classes tab has examples of various useful CSS statement including the z-index.
*Given you are using a user defined class you could try using !important after the z-index statement and that should take precedence.
Gotcha, thanks, I think I'm back on my horse. I'm just getting started, and it's still way under construction but it's taking shape.
I like it. Your table and chairs is very creative. How did you do that?
I’d like to add more icons to the app as I see what people are using and what they request.
That was a little bit of a challenge that I wanted to solve as I plan to add others (couch, island, etc). The table is an image tile pointing to my Google photos (so it works when viewing via cloud but it takes a bit of editing with GiMP to get it exactly right with the correct background color, rotation, etc) but I couldn't get the light to appear above it. No matter what I did with the z-indexes the table always obscured the light. So what I did was make the entire dashboard background the background color of the room and made the room 100% transparent. I then put the table on the lowest z-index and put the room tile over it. I'm sure as I try to add more things I'll find new challenges bit so far there seems to be ways to solve.
Will PM you my specs so you can create my layout. Take your time, I can wait up to a day for a final draft that is perfect. 
This thread has been consolidated with the main Tile Builder thread which can be found here.
Closed per OP's request.

