JSFiddle - React, Tailwind, and code Playground

HTML

<button class="first">
<
</button>
<button class="second">
>
</button>

CSS

.first, .second {
  border: none;
}

.first::after {
  display: inline-block;
  content: '';
  width: 20px;
  height: 20px;
  background: red;
  margin-left: 15px;
}