JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
  <div class="overlay"></div>
</div>

CSS

html,
body {
  padding: 0;
  margin: 0;
}

.wrapper {
  position: relative;
  width: 100%;
  height: 300px;
  background: yellow;
  margin: 0;
}

.overlay {
  position: absolute;
  top: 50%;
  left: 5%;
  transform: translateY(-50%);
  width: 90%;
  height: 100px;
  background: rgba(0, 0, 0, .5);
}