JSFiddle - React, Tailwind, and code Playground

HTML

<div class="bradius">
Border animation
</div>
</div>

CSS

.bradius {
  padding: 20px 40px;
  color: #fff;
  width:40%;
  text-align:center;
  background-color: #0071bc;
      -webkit-transition: all 0.2s;
    -moz-transition: all 0.2s;
    -o-transition: all 0.2s;
    transition: all 0.2s;
}
.bradius:hover {
  color: #fff;
  -webkit-border-radius: 10px;
  -moz-border-radius: 10px;
  -ms-border-radius: 10px;
  -o-border-radius: 10px;
  border-radius: 10px;
}