JSFiddle - React, Tailwind, and code Playground

HTML

<div class="test">
  <ol>
    <li>содержание</li>
    <li>содержание</li>
    <li>содержание</li>
  </ol>
</div>

CSS

.test ol {
  list-style: none;
  counter-reset: point
}

.test ol li {
  position: relative;
  padding-left: 25px;
  counter-increment: point 1
}

.test ol li::before {
  font-size: 11px;
  font-weight: bold;
  position: absolute;
  top: 4px;
  left: 0;
  width: 20px;
  padding: 0;
  content: counter(point);
  text-align: center;
  color: #fff;
  background: brown
}