JSFiddle - React, Tailwind, and code Playground

HTML

<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Eum facere voluptas soluta iste possimus, dolorum aliquam alias cupiditate nostrum placeat laudantium, culpa perferendis, laboriosam omnis neque aperiam! Voluptas, necessitatibus, ipsa.</p>
<table id="the-table">
    <thead>
        <tr>
            <th class="domain-col">Name</th>
            <th>Size</th>
        </tr>
    </thead>
    <tbody>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
        </tr>
        <tr>
            <td>Joe</td>
            <td>40</td>
      ...

CSS

th {
    background-color:red;
}
#the-table {
    width: 50%;
    margin: 0 auto;    
    position: relative;
}
#the-table thead th {
    position: sticky;
    top:0;
}