JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
  <div class="sub-con">
    <div class="col-one"></div>
    <div class="col-two"></div>
  </div>
</div>

CSS

.container {
   display: flex;
   justify-content: center;
   align-items: center;
   flex-flow: row wrap;
   height: 100vh;
 }
 
 .sub-con {
   flex: 1;  /* for demo only */
   align-content: flex-start; /* for demo only */
   margin-right: 50px;
   margin-left: 50px;
   height: 500px;
   background-color: #fff;
   display: flex;
   justify-content: center;
   flex-flow: row wrap;
 }
 
 .col-one {
   width: 200px;
   height: 100px;
   border: 1px solid lightgreen;
 }
 
 .col-two {
   width: 200px;
   height: 100px;
   border: 1px solid red;
 }