Javascript effect click changing z-index

Hello friends, first apology, I’m using google translator.

I have a fairly simple question, when you click a button, call a div, but are 9, all being stacked in absolute position, but each click would have to put the active first with z-index.

Link example: http://plano-de-estudo-ed-engajamento-6.webflow.io/slide-07-caracteristicas-do-aluno-eficiente

Thank you everyone for the attention!

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