JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
<div class="wrapper"><div class="item a">A</div></div>
<div class="wrapper"><div class="item b">B</div></div>
</div>

CSS

.wrapper {
    display: inline-block;
    height: 100px;
    margin: 20px;
    position: relative;
    width: 100px;
}

.item {
    color: white;
    display: inline-block;
    font-family: Calibri, Arial;
    font-size: 32px;
    line-height: 100px;
    position: absolute;
    text-align: center;
    width: 100px;
    z-index:1;
    -webkit-transition: all 1s ease-in-out;
    -moz-transition: all 1s ease-in-out;


}

div.item:hover {
    padding-right: 100px;
    z-index: 9999;
}

.a {background:red;}
.b {background:blue;}