JSFiddle - React, Tailwind, and code Playground

HTML

<div id='portfolio-overlay'>
    <div class='portfolio'><img src=""/></div>
    <div class='portfolio'><img src=""/></div>
    <div class='portfolio'><img src=""/></div>
    <div class='portfolio'><img src=""/></div>
    <div class='portfolio'><img src=""/></div>
    <div class='portfolio'><img src=""/></div>
    <div class='portfolio'><img src=""/></div>
    <div class='portfolio'><img src=""/></div>
    <div class='portfolio'><img src=""/></div>
    <div class='portfolio'><img src=""/></div>
</div>

CSS

#portfolio-overlay {
    margin: auto;
    position: absolute;
    text-align:centre;
    top: 0;
    width: 100%;
    z-index: 1;
}

.portfolio img {
    float: left;
    max-width: 400px;
    margin:2%;
    width: 25%;
}