is now part of Shuffle™. You can use the editor on this domain, but we encourage you to try Shuffle →. Shuffle™ includes templates for Tailwind CSS, Bootstrap, Bulma, and Material-UI.
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Tailwind CSS class: .w-3

<span class="w-3 h-4 block bg-teal-400"></span>

Preview

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CSS source

.w-3 { width: 0.75rem; }

More in Tailwind CSS Width