JSFiddle - React, Tailwind, and code Playground

HTML

<div>
    <span>Hover Me</span>
    <span>Reveal</span>
</div>

CSS

div {
    margin: 100px;
    position: relative;
    border: 1px solid #aaa;
    height: 30px;
}

div span {
    position: absolute;
    left: 0;
    width: 100px;
    background: #fff;
    top: 0;
    -moz-transition: all 1s;
    -webkit-transition: all 1s;
    transition: all 1s;
}

div span:nth-of-type(1) {
    z-index: 1;
}

div:hover span:nth-of-type(1) {
    top: -40px;
}