JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div>
    <h1>Заголовок</h1>
    <p>Параграф</p>
  </div>
</div>

CSS

.container {
  display: flex;
  align-items: center;
  padding: 5px 12px 5px 5px;
  border: 1px solid #000;
}

.container::before {
  content: "";
  align-self: stretch;
  display: block;
  width: 2px;
  min-height: 46px;
  margin-right: 10px;
  border-radius: 2px;
  background-color: red;
}