JSFiddle - React, Tailwind, and code Playground

HTML

<div class='container'>
  <div class="post-container">
    <div class="post-thumb"><img src="https://images.freeimages.com/images/small-previews/f2c/effi-1-1366221.jpg" /></div>
  </div>
  //A few other thigs
  <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quo impedit fugit commodi tempora, corporis, repudiandae iusto similique quae quibusdam cumque iste dolores dignissimos natus quos, iure voluptatem. Sunt laudantium, quasi!</p>
</div>

CSS

.post-container {
  display: flex;
  justify-content: center;
  align-items: center;
}

.post-thumb {
  display: flex;
  justify-content: center;
  align-items: center;
}

.post-thumb img {
  max-width:100%;
}