JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapp">
  <ul class="list">
    <li class="list__item"><a href="" class="list__link">ABOUT</a></li>
    <li class="list__item"><a href="" class="list__link">ABOUT</a></li>
    <li class="list__item"><a href="" class="list__link">ABOUT</a></li>
    <li class="list__item"><a href="" class="list__link">ABOUT</a></li>
  </ul>
</div>

CSS

.wrapp{
  display: block;
  position: relative;
  overflow: hidden;
  width: 400px;
  height: 400px;
  text-align: center;
  background: #6554aa;
}

.list {
 list-style:none;
 width: 50%;
 padding: 0;
 margin: 0 auto;
 background: #ccc;
 text-align: center;
 border-left:10px solid black;
}


.list__link {
  position: relative;
  display: block;
  width: 100%;
  padding: 10px 0;
  color:purple;
  font-weight:bold;
  font-size: 21px;
  text-decoration: none;
   margin-bottom:5px;
}

.list__link:after {
 position: absolute;
 display: block;
 content: '';
 width: 0;
 height: 2px;
 top: 101%;
 left: 0;
 background: purple;

 transition: width ease-in-out .5s;
}
.list__link:last-child{
  margin-bottom: 0px;
}

.list__link:hover:after {
  width: 100%;
}