JSFiddle - React, Tailwind, and code Playground

by bukov

HTML

<table class="box" border="1px">
    <tr>
        <td>
            my content
        </td>
    </tr>
</table>

CSS

.box {
    width:300px;
    height:300px;
    background-color:#d9d9d9;
    position:fixed;
    margin-left:-150px; /* half of width */
    margin-top:-150px;  /* half of height */
    top:50%;
    left:50%;
}