JSFiddle - React, Tailwind, and code Playground

HTML

<div class="a"></div>
<div class="b"></div>
<div class="c"></div>

CSS

.a, .b, .c {
    width: 100px;
    height: 100px;
    position: absolute;
}
.a {
    background: red;
    z-index:999;
}
.b {
    background: green;
    left:40px;
    z-index: 500;
}
.c {
    background: gray;
    left:80px;
    z-index: 100;
}