I'm using a DIV with the message "processing" and opaque background every time a request occurs (user iteration at the click of a button). However, this screen is also displayed when I am with an open modal screen, and ends up happening that the processing screen does not overlap on the modal screen. My entire layout was developed with Bootstrap 3. How do I override the processing div on modal?
CSS offers the possibility of working in layers on your pages, so you can overlay elements on each other using the z-index property ...
As you said that the bootstrap uses a z-index value of 1050 you can change this by overriding the css rule for the modal z-index, to do this your style sheet needs to be below the sheet of the Bootstrap sheet in your HTML document or else the only rules that will be overwritten are yours.
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The solution is you render the HTML of the modal processing after the modal register. To organize everything, follow the example:
<div id="modalCadastro"></div>
<div id="modalProcessamento"></div>
When you call the processing modal, it will override the other modal.