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Tailwind CSS class: .top-0 / .top-*

<div class="relative h-16 w-16 bg-gray-400 m-2">
  <div class="absolute top-0 h-4 w-full bg-teal-400"></div>
</div>
<div class="relative h-16 w-16 bg-gray-400 m-2">
  <div class="absolute top-auto bottom-0 h-4 w-full bg-teal-400"></div>
</div>

Preview

CSS source

.top-0 { top: 0; }
.top-auto { top: auto; }

More in Tailwind CSS Positioning