JSFiddle - React, Tailwind, and code Playground

HTML

<div id='post_holder'>
    <img src='http://www.motifake.com/image/demotivational-poster/1007/nikola-tesla-nikola-tesla-electricity-gangster-history-demotivational-poster-1278216588.jpg'>
</div>

CSS

#post_holder{
  border:1px solid red; 
  width:50px;
  height:300px; 
}

#post_holder img{
 width:100%; 
 height:100%;  
}