JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
    <title>Document</title>
</head>
<body>
  <table>
    <thead>
      <tr>
        <th>
          标题
        </th>
        <th>
          序号
        </th>
        <th>
          不知道
        </th>
      </tr>
    </thead>
    <tbody>
      <tr>
        <td>
          123
        </td>
        <td>
          123
        </td>
      </tr>
    </tbody>
  </table>
</body>

</html>

CSS

table{
  border-collapse: collapse;
  width: 600px;
}
tr{
  border-bottom: 1px solid black;
}
td{
  text-align: center;
}