JSFiddle - React, Tailwind, and code Playground

by Artem Borovikov

HTML

<div class="QA-wrapper">
    <div class="q">Button</div>
    <div class="a">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Modi quidem, natus officia sed consequuntur eum impedit, molestias perferendis odio reiciendis nisi praesentium placeat accusamus magnam quis rem aut eligendi sapiente.</div>
</div>

CSS

.QA-wrapper {
    position: relative;
    margin-top: 150px;
}

.a {
    opacity: 0;
    visibility: hidden;
    position: absolute;
    z-index: 9;
    bottom: 0;
    left: 0;
    width: 0;
    height: 0;
    background-color: red;
    transition: width 150ms ease;
}

.q:hover + .a,
.a:hover {
    opacity: 1;
    visibility: visible;
    width: 100%;
    height: auto;
}