JSFiddle - React, Tailwind, and code Playground

by Kalashnikov

HTML

<div class="parent"><div class="children"></div><div class="children"></div><div class="children"></div><div class="children"></div></div>

CSS

.parent {
    background: silver;
    position: absolute;
    width: 180px;
    height: 180px;
}

.children {
    background: #33c;
    width: 50px;
    height: 50px;
    display: inline-block;
    margin: 20px;
    z-index: 2;
}

.parent::before {
    content: "";
    display: block;   
    background: #c33;
    width: 70px;
    height: 70px;
    position: absolute;
    top: 55px;
    left: 55px;
    z-index: 1;
}