JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <img class="first" src="http://lorempixel.com/400/200">
  <img class="second" src="http://lorempixel.com/400/200">
</div>

CSS

div:hover img{
    opacity:0.5            
}
div:hover img:hover{
     opacity:1           
}