JSFiddle - React, Tailwind, and code Playground

HTML

<div class="div1">A</div>
<div class="div2">B</div>
<div class="div3">C</div>

CSS

div {
    width: 100px;
    height: 100px;
    background-color: #666;
    border-color: #333;
    border-style: solid;
    position: absolute;
    line-height: 100px;
    text-align:center;
    font-size:50px;
}
.div1 {
    left: 91px;
    top: 66px;
}
.div2 {
    left: 132px;
    top: 152px;
}
.div3 {
    left: 171px;
    top: 90px;
}

JavaScript

$('.div1, .div2, .div3').click(function(){
   $(this).css('zIndex',200);
    $('div').css('zIndex',2);
});