JSFiddle - React, Tailwind, and code Playground

HTML

<div class="modal">
    <h1>Modal Title</h1>
    <p>Some modal Content</p>
</div>

CSS

.modal {
    width:400px; 
    height:200px;
    position:absolute; /* Position above other content on the page */
    top:200px; 
    left:50%; 
    margin-left:-200px; /* Negate the left: 50% */
    border-radius:10px;
    box-shadow:0 0 0px 10px rgba(0, 0, 0, 0.5);
    padding:10px;
}