JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li><a href="#">Главная</a></li>
    <li><a href="#">Продукция</a></li>
    <li><a href="#">Контакты</a></li>
    <li><a href="#">О нас</a></li>
</ul>

CSS

li {
    display: inline-block;
    font-family: Arial, Helvetica, sans-serif;
    font-size: 16px;
}
a {
    display: block;
    padding: 10px;
    line-height: 25px;
    color: #333;
    text-decoration: none;
    -webkit-transition: .6s;
    transition: .6s;
}
a:hover {
    border-radius: 20px;
    background-color: #4FB423;
}