JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
<li><a href="#">item1</a></li>
<li><a href="#">item1</a></li>
<li><a href="#">item1</a></li>
<li><a href="#">item1</a></li>
</ul>

CSS

ul {
display:flex;
flex-wrap: wrap;
}
li {
    list-style: none;
    flex-direction: column;
    display: flex;
    border: 2px solid black;
    background-color: grey;
    height: 40px;
    padding: 0;
    margin: 0 10px;
}
a {
    display: inline-block;
    width: 60px;
}