<div class="container">
  <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
    <text x="50%" y="50%" style="dominant-baseline:central;text-anchor:middle;font-size:90px;">
      😸
    </text>
  </svg>
</div>

.container {
  text-align: center;
}
svg {
  width: auto;
  height: 100vh;
}