JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.flex-container {
    display: -webkit-flex;
    display: flex;
    width:400px;
   height:400px;
   background-color:#bfbfbf
}

.flex-item {
    background-color: cornflowerblue;
    width: 100px;
    height: 100px;
    margin: 10px;
}