JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block">
  <div class="block_title"><span></span><b>текст</b><span></span></div>
  <p>
    текст текст текст текст текст текст текст текст
  </p>
</div>

CSS

* {
  margin: 0;
  padding: 0;
}

.block {
  margin: 20px;
  padding: 20px;
  position: relative;
  border-width: 0 2px 2px 2px;
  border-style: solid;
  border-color: #444;
}

.block_title {
  height: 30px;
  line-height: 30px;
  position: absolute;
  top: -15px;
  left: 0;
  right: 0;
  text-align: center;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
}

.block_title > b {
  padding: 0 10px;
}

.block_title > span {
  width: 50%;
  height: 2px;
  margin: 15px 0 13px 0;
  background: #444;
}