JSFiddle - React, Tailwind, and code Playground

HTML

<table>
    <tr>
        <td>1</td>
        <td>2</td>
        <td>3</td>
    </tr>
    <tr>
        <td>4</td>
        <td>5</td>
        <td>6</td>
    </tr>     
</table>

CSS

*::-moz-focus-inner {
  border: 0;
}

table {
    border-collapse: collapse;               
}


table tr td {
    border: 1px solid gray;    
    padding: 5px;        
}