JSFiddle - React, Tailwind, and code Playground

HTML

<div class="block block-1">
  Текст в 2 <br>строчки
</div>
<div class="block block-2">
  <span>Текст в 2 <br>строчки</span>
</div>

CSS

.block
{
  background: #eee;
  border: 1px solid #ccc;
  height: 150px;
  position: relative;
  margin: 20px;
}

.block-1
{
  align-items: center;
  display: flex;
  justify-content: center;
}

.block-2
{
  line-height: 150px;
  text-align: center;
}

.block-2 span
{
  display: inline-block;
  line-height: 1;
  vertical-align: middle;
}

.block-3::after
{
  content: ' ';
  display: inline-block;
  height: 100%;
  vertical-align: middle;
}