JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
 <img class="one" src="http://lorempixel.com/400/200" />
 <img class="two" src="http://lorempixel.com/400/200" />
 <img class="three" src="http://lorempixel.com/400/200" />
</div>

CSS

.container > img:not(.two) {
     -webkit-filter: grayscale(100%);
    filter: grayscale(100%);
}