JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    Lorem Ipsum
</div>

CSS

.container{
    background:lightblue;
    height:1000px;
    -webkit-animation: expand 5s;
}

@-webkit-keyframes expand{
    0%{height:0px}
    100%{height:1000px}
}