JSFiddle - React, Tailwind, and code Playground

HTML

<div>

</div>

CSS

@keyframes taille {
    0% {width: 50px}
    75% {width: 200px}
}
div {
    height: 100px;
    width: 200px;
    background-color: blue;
    animation-name: taille;
    animation-duration: 4s;
    animation-delay: 2s;
    animation-fill-mode: backwards;
}