JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <ul>
        <li>A list</li>
    </ul>
</div>

CSS

.container {
    position: relative;
    width: 80%;
    height: 90%;
    background-color: #282828;
    box-shadow: inset -6px -6px 6px -2px #1d1d1d;
    color: #FFF;
    border-radius: 0 10px 0 0;
    float: left;
}

.container {
    text-align:center
}

.container ul {
    padding:0;
    display:inline-block;
}