Tutorial Fixing IE z-index
This isn't an end-all-be-all solution to fixing all weird IE z-index issues, but it certainly can help in some circumstances. What it do...
https://iskablogs.blogspot.com/2014/03/tutorial-fixing-ie-z-index.html
This isn't an end-all-be-all solution to fixing all weird IE z-index issues, but it certainly can help in some circumstances. What it does is loop through each of the elements that you declare and apply ever-declining z-index values on them. IE gets this backwards, and this sets it correctly. The reason it's not end-all-be-all is because sometimes it's not DOM-order that you need z-index to be in