Examples

Basic example

Use utilities like outline-rose-500 and outline-lime-100 to control the color of an element's outline:

Changing the opacity

Use the color opacity modifier to control the opacity of an element's outline color:

Using a custom value

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

<div class="outline-[#243c5a] ...">
  <!-- ... -->
</div>

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

<div class="outline-(--my-color) ...">
  <!-- ... -->
</div>

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

Responsive design

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

<div class="outline md:outline-blue-400 ...">
  <!-- ... -->
</div>

Learn more about using variants in the variants documentation.

Customizing your theme

Use the --color-* theme variables to customize the color utilities in your project:

@theme {
  --color-regal-blue: #243c5a; 
}

Now the outline-regal-blue utility can be used in your markup:

<div class="outline-regal-blue">
  <!-- ... -->
</div>

Learn more about customizing your theme in the theme documentation.