JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <thead>
        <tr>
            <th style="padding:9px">Header 1</th>
            <th style="padding:9px">Header 2</th>
            <th style="padding:9px">Header 3</th>
        </tr>
    </thead>
    <tbody>
        <tr height="40"></tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
        </tr>
        <tr>
            <td>AAAAAA 1</td>
            <td>BBBBBB 2</td>
            <td>CCCCCC 3</td>
    ...

CSS

thead {
    position:fixed;
    background-color:blue;
    color:#fff;
}

tbody {

}