是否可以将文本垂直居中

.container {
  display: flex;
  align-items: center;
  justify-content: center;
}

<table>
  <tr>
    <td>
      <p>文本内容</p>
    </td>
  </tr>
</table>

table {
  display: table;
  height: 100%;
}

td {
  vertical-align: middle;
}

<div class="container">
  <p>文本内容</p>
</div>

.container {
  position: relative;
  height: 100%;
}

.container p {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}