Unocss

<div ="grid grid-cols-3 gap-4 dark:grid-cols-2">
  <div ="card"></div>
  <div ="card"></div>
  <div ="card"></div>
  <div ="card"></div>
</div>
<style>
  .card {
    --at-apply: h-[100px] flex items-center justify-center
      rounded bg-rose-5 dark:bg-blue-5;
  }
</style>

<div ="sm:text-5 sm:text-rose-5 text-blue-5 text-10">
  This is a text with different font size and color in wide or narrow width device
</div>

<div ="text-[56px]">
  <div ="i-openmoji-red-apple"></div>
  <div ="i-openmoji-banana"></div>
  <div ="i-openmoji-grapes"></div>
</div>