JSFiddle - React, Tailwind, and code Playground

HTML

<div class="bildlink">
    <a href="#">
        <img alt="Bild" src="http://gcmaz.com/wp-content/gallery/test/sample1-c78a690251ae02408f6e58ffe8ce054b6bb53302.jpg" />
    </a>
</div>

CSS

.bildlink a img:hover {opacity: 0.5;}