JSFiddle - React, Tailwind, and code Playground
HTML
<ul>
<li><a class='selected' href=#>Home</a></li>
<li><a href=#>Pagina 1</a></li>
<li><a href=#>Pagina 2</a></li>
<li><a href=#>Pagina 3</a></li>
</ul>CSS
ul li a{ font-size: 15px }
.selected {font-size: 30px }