HTML -设置垂直表格的格式

<style>
    table {
        border-collapse: collapse;
        width: 100%;
    }
    
    td {
        border: 1px solid black;
        padding: 8px;
        text-align: center;
        vertical-align: middle; /* 设置垂直对齐方式为居中 */
    }
</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>
    <tr>
        <td>单元格7</td>
        <td>单元格8</td>
        <td>单元格9</td>
    </tr>
</table>