JSFiddle - React, Tailwind, and code Playground

HTML

<table style="width:600px;">
    <tr>
        <td style="width:30%">header1</td>
        <td style="width:50%">header2</td>
        <td style="width:20%">header3</td>
    </tr>
    <tr>
        <td>something1</td>
        <td>something2</td>
        <td>something3</td>
    </tr>
</table>

CSS

table {
    border-spacing:0;
}
td {
    border-bottom: 1px solid black;
}