JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
<li class="one">Number 1</li>
<li class="two">Number 2</li>
<li class="three">Number 3</li>
</ul>

CSS

li.one {
  font-size:25px
}

li.two {
  font-size:20px
}

li.three {
  font-size:15px
}