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Tailwind CSS class: .box-content

<div class="box-content h-20 w-20 p-4 border-4 border-teal-400 bg-teal-200">
  <div class="h-full w-full bg-teal-400"></div>
</div>

Preview

CSS source

.box-content {
    box-sizing: content-box;
}

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