JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="elem1" style="height: 50px; background-color: black;"></div>
  <div class="elem2" style="height: 50px; background-color: black;"></div>
</div>

CSS

* {
  margin: 0;
  padding: 0;
}

.container {
  width: 75%;
  border: 1px solid red;
  margin: 0 auto;
  position: relative;
  display: inline-block;
}

.elem1 {
  width: 47.5%;
  margin-right: 2.25%;
  display: inline-block;
}

.elem2 {
  width: 47.5%;
  margin-right: 2.25%;
  display: inline-block;
}