JSFiddle - React, Tailwind, and code Playground

HTML

<div class="mydiv">

<img src="http://www.francodacosta.com/wp-content/uploads/resize_200_150.png">

</div>

CSS

.mydiv
{
    width:200px;
    height:150px;
    border: 1px solid red;
}

.mydiv img 
{
    width:100%;
}