Question

Utilities for controlling the width of an element's outline.

Quick reference

Class	Properties
outline-0	outline-width: 0px;
outline-1	outline-width: 1px;
outline-2	outline-width: 2px;
outline-4	outline-width: 4px;
outline-8	outline-width: 8px;

Basic usage

Setting the outline width

Use the outline-* utilities to change the width of an element’s outline.

outline-1

outline-2

outline-4

<button class="outline outline-offset-2 outline-1 ...">Button A</button>
<button class="outline outline-offset-2 outline-2 ...">Button B</button>
<button class="outline outline-offset-2 outline-4 ...">Button C</button>

The default outline width is 3px.

---

Applying conditionally

Hover, focus, and other states

Tailwind lets you conditionally apply utility classes in different states using variant modifiers. For example, use hover:outline-2 to only apply the outline-2 utility on hover.

<div class="outline hover:outline-2">
  <!-- ... -->
</div>

For a complete list of all available state modifiers, check out the Hover, Focus, & Other States documentation.

Breakpoints and media queries

You can also use variant modifiers to target media queries like responsive breakpoints, dark mode, prefers-reduced-motion, and more. For example, use md:outline-2 to apply the outline-2 utility at only medium screen sizes and above.

<div class="outline md:outline-2">
  <!-- ... -->
</div>

To learn more, check out the documentation on Responsive Design, Dark Mode and other media query modifiers.

---

Using custom values

Customizing your theme

You can customize the outline-* utilities by editing theme.outlineWidth or theme.extend.outlineWidth in your tailwind.config.js file.

tailwind.config.js

module.exports = {
  theme: {
    extend: {
      outlineWidth: {
        5: '5px',
      }
    }
  }
}

Learn more about customizing the default theme in the theme customization documentation.

Arbitrary values

If you need to use a one-off outline-width value that doesn’t make sense to include in your theme, use square brackets to generate a property on the fly using any arbitrary value.

<div class="outline-[5px]">
  <!-- ... -->
</div>

Learn more about arbitrary value support in the arbitrary values documentation.