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Showing content from https://developer.mozilla.org/en-US/docs/Web/CSS/outline-color below:

outline-color - CSS | MDN

Try it
outline-color: rgb(170 50 220 / 0.6);
outline-color: hsl(60 90% 50% / 0.8);
outline-color: currentColor;
<section class="default-example" id="default-example">
  <div class="transition-all" id="example-element">
    This is a box with an outline around it.
  </div>
</section>
#example-element {
  outline: 0.75em solid;
  padding: 0.75em;
  width: 80%;
  height: 100px;
}
Syntax
/* <color> values */
outline-color: #f92525;
outline-color: rgb(30 222 121);
outline-color: blue;

/* Global values */
outline-color: inherit;
outline-color: initial;
outline-color: revert;
outline-color: revert-layer;
outline-color: unset;

The outline-color property is specified as any one of the values listed below.

Values
<color>

The color of the outline, specified as a <color>.

The specification also lists an additional value, auto, which is not currently supported in any browsers. When implemented, auto will compute to currentColor unless outline-style is set to auto then it will compute to the accent color.

Description

An outline is a line that is drawn around an element, outside the border. Unlike the element's border, the outline is drawn outside the element's frame, and may overlap other content. The border, on the other hand, will actually alter the page's layout to ensure that it fits without overlapping anything else (unless you explicitly set it to overlap).

It is often more convenient to use the shorthand property outline when defining the appearance of an outline.

Accessibility

Custom focus styles commonly involve making adjustments to the outline property. If the color of the outline is adjusted, it is important to ensure that the contrast ratio between it and the background the outline is placed over is high enough that people experiencing low vision conditions will be able to perceive it.

Color contrast ratio is determined by comparing the luminosity of the text and background color values. In order to meet current Web Content Accessibility Guidelines (WCAG), a ratio of 4.5:1 is required for text content and 3:1 for larger text such as headings. Large text is defined as 18.66px and bold or larger, or 24px or larger.

Formal definition Initial value auto Applies to all elements Inherited no Computed value For the keyword auto, the computed value is currentcolor. For the color value, if the value is translucent, the computed value will be the rgba() corresponding one. If it isn't, it will be the rgb() corresponding one. The transparent keyword maps to rgba(0,0,0,0). Animation type a color Formal syntax
outline-color = 
auto |
<color> |
<image-1D>

<image-1D> =


<stripes()>

<stripes()> =


stripes( <color-stripe># )

<color-stripe> =


<color> &&
[ <length-percentage> | <flex> ]?

<length-percentage> =


<length> |
<percentage>
Examples Setting a solid blue outline HTML
<p>My outline is blue, as you can see.</p>
CSS
p {
  outline: 2px solid; /* Set the outline width and style */
  outline-color: blue; /* Set the outline color */
  margin: 5px;
}
Result Specifications Browser compatibility

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See also

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