JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
<ul>
    <li>item1</li>
    <li>item1</li>
    <li>item1</li>
    <li>item1</li>
    <li>item1</li>
    <li>item1</li>
</ul>
</div>

CSS

.container {
    width: 450px;
    border: 1px solid black;
}
.container ul {
    padding: 0; 
    margin: 0;
    list-style-type: none;
}
.container ul li {
    width: 150px;
    height: 100px;
    background-color: red;
    float: left;
}