JSFiddle - React, Tailwind, and code Playground

HTML

<div class="expandIMG">
    
    <img src="http://placehold.it/200x200">
        
</div>

CSS

.expandIMG {
    background: rgba(0,0,0,1);
}

.expandIMG:hover{
  background: rgba(0,0,0,0.6);
}