如何使单独表格的所有元素居中HTML

<style>
    table {
        margin: 0;
        padding: 0;
    }
</style>

<style>
    table {
        margin: 0;
        padding: 0;
        text-align: center;
    }
</style>

<style>
    table {
        margin: 0;
        padding: 0;
        text-align: center;
    }
    
    td {
        vertical-align: middle;
    }
</style>

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