JSFiddle - React, Tailwind, and code Playground

HTML

<div class="element">
  <h3>Lorem ipsum </h3><div class="line"></div>
</div>

CSS

.element {
  display: flex;
  align-items: center;
}

.line {
  flex: 1;
  height: 1px;
  background: red;
  margin-left: 10px;
}