JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="flex-item">1</div>
  <div class="flex-item">2</div>
  <div class="flex-item">3</div>
  <div class="flex-item">4</div>
  <div class="flex-item">5</div>
  <div class="flex-item">6</div>
</div>

CSS

.container {
  display: flex;
  justify-content: space-between;
  align-content: space-between;
    width:100%;
}

.flex-item {
      height: 50px;
  width: 50px;
  background: #16193B;
  text-align: center;
  color: #fff;
    
}