JSFiddle - React, Tailwind, and code Playground

HTML

<div class="img-grid">
    <div class="img-grid-item-holder">
        <img src="http://www.lorempixel.com/400/800/cats" />
    </div>
    <div class="img-grid-item-holder">
        <img src="http://www.lorempixel.com/350/750/cats" />
    </div>
    <div class="img-grid-item-holder">
        <img src="http://www.lorempixel.com/500/600/cats" />
    </div>
    <div class="img-grid-item-holder">
        <img src="http://www.lorempixel.com/410/430/cats" />
    </div>
    <div class="img-grid-item-holder">
        <img src="http://www.lorempixel.com/320/650/cats" />
    </div>
    <div class="img-grid-item-holder">
        <img src="http://www.lorempixel.com/350/750/cats" />
    </div>
    <div class="img-grid-item-holder">
        <img src="http://www.lorempixel.com/500/600/cats" />
    </div>
</div>

CSS

.img-grid .img-grid-item-holder {
	
	float: left;
	width: 25%;
	overflow: hidden;
    padding: 0px;
    margin: 0px;
}

.img-grid img {
	width: 100% !important;
	height: auto !important;
}