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<div class="container">
  <span>Lorem ipsum</span>
</div>

Absolute positioning + Transform

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.container {
  position: relative;
}

span {
  display: inline-block;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}

Flexbox

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

Grid

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.container {
  display: grid;
}

span {
  margin: auto;
}