JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
  <div class="child">I'm vertically centered multiple lines of text in a container. Centered with a ghost pseudo element</div>
</div>

CSS

.parent {
  background: white;
  height: 300px;
  margin: 20px;
  width: 300px;
  position: relative;
  resize: vertical;
  overflow: auto;
}
.child {
  position: absolute;
  top: 50%;
  left: 20px;
  right: 20px;
  height: 100px;
  margin-top: -70px;
  background: black;
  color: white;
  padding: 20px;
}