Z-index not working?

Good night.
there is a draggable object(span) but the odd does not work Z-index. Already different methods would change everything but to no avail..
What's wrong? Thanks for the replies.
July 8th 19 at 16:45

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July 8th 19 at 16:47
jqueryui.com/draggable but this does not help ?
even in the example, the block goes low if its in the top draw. - Josiane75 commented on July 8th 19 at 16:50
although there infram.. its not helping.. - Josiane75 commented on July 8th 19 at 16:53

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