JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
    <div class="wrap">
        <div class="foo"></div>
    </div>
    <div class="wrap">
        <div class="foo"></div>
    </div>
    <div class="wrap">
        <div class="foo"></div>
    </div>
    <div class="wrap">
        <div class="foo"></div>
    </div>
    <div class="wrap">
        <div class="foo"></div>
    </div>
    <div class="wrap">
        <div class="foo"></div>
    </div>
</div>
<div class="row">
    <div class="wrap">
        <div class="foo"></div>
    </div>
    <div class="wrap">
        <div class="foo"></div>
    </div>
    <div class="wrap">
        <div class="foo"></div>
    </div>
</div>

CSS

.wrap {
    position: relative;
    height:20px;
    width:20px;
    display: inline-block;
}
.foo {
    position: absolute;
    top: 190px;
    left: 190px;
    background: #4FC093;
    display: block;
    width: 20px;
    height: 20px;
    box-shadow: 0 0 10px inset;
    border-radius: 50%;
    cursor: pointer;
    transition:all 3s ease;
    z-index: 99;
    /*using an unnecessarily large z-index makes for a nicer transition in Chrome*/
}
.foo:hover {
    top: 0px;
    left: 0px;
    width: 400px;
    height: 400px;
    box-shadow: 0 0 200px inset;
    transition:all 3s ease;
    z-index: 1;
}