outline-width

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

Quick reference

Class	Styles
outline	outline-width: 1px;
outline-<number>	outline-width: <number>px;
outline-(<custom-property>)	outline-width: var(<custom-property>);
outline-[<value>]	outline-width: <value>;

Source: https://tailwindcss.com/guide/outline-width

Examples

Basic example

Use outline or outline-<number> utilities like outline-2 and outline-4 to set the outline width of an element:

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

Applying on focus

Use the focus: prefix to conditionally apply an outline width on focus:

<button class="outline-offset-2 outline-sky-500 focus:outline-2">
  Save Changes
</button>

Using a custom value

Use the outline-[<value>] syntax to set the outline width based on a completely custom value:

<button class="outline-[2vw] outline-offset-2">
  Custom
</button>

For CSS variables, you can also use the outline-(<custom-property>) syntax:

<button class="outline-(--my-outline-width) outline-offset-2">
  <!-- ... -->
</button>

This is just a shorthand for outline-[var(<custom-property>)] that adds the var() function for you automatically.

Responsive design

Prefix an outline-width utility with a breakpoint variant like md: to only apply the utility at medium screen sizes and above:

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

Learn more about using variants in the variants documentation.