Width utilities sit under the w- prefix. w-full and w-auto cover the common cases, w-max-0–w-max-10 cap width against the width scale, and w-min-0 lets a flex child shrink below its content.

<div class="w-max-7 surface-base br-m p-m">
  <p class="w-full">Full width, capped at the scale.</p>
</div>