JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script src="https://code.jquery.com/jquery-1.12.3.js"></script>
<div class="container">
  <div class="square_container">
    <div class="square">
      box1
    </div>
    <div class="square">
      box2
    </div>
    <div class="square">
      box3
    </div>
    <div class="square">
      box4
    </div>
    <div class="square">
      box5
    </div>
  </div>
</div>

CSS

.square_container {
  display: flex;
  flex-direction: row;
  justify-content: center;
  flex-wrap: wrap;
}

.square {
  background-color: red;
  height: 150px;
  width: 150px;
  margin: 20px;
}