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Tailwind CSS class: .flex-1

<div class="flex bg-gray-200">
  <div class="flex-1 bg-teal-400 p-4 m-2">1</div>
  <div class="flex-1 bg-teal-400 p-4 m-2">2</div>
  <div class="flex-1 bg-teal-400 p-4 m-2">3</div>
</div>

Preview

1
2
3

CSS source

.flex-1 {
    flex: 1 1 0%;
}

More in Tailwind CSS Flex