`border-bottom-color` CSS property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It's been available across browsers since July 2015.

The border-bottom-color CSS property sets the color of an element's bottom border. It can also be set with the shorthand CSS properties border-color or border-bottom.

Try it

border-bottom-color: red;

border-bottom-color: #32a1ce;

border-bottom-color: rgb(170 50 220 / 0.6);

border-bottom-color: hsl(60 90% 50% / 0.8);

border-bottom-color: transparent;

<section class="default-example" id="default-example">
  <div class="transition-all" id="example-element">
    This is a box with a border around it.
  </div>
</section>

#example-element {
  background-color: #eeeeee;
  color: black;
  border: 0.75em solid;
  padding: 0.75em;
  width: 80%;
  height: 100px;
}

Syntax

/* <color> values */
border-bottom-color: red;
border-bottom-color: #ffbb00;
border-bottom-color: rgb(255 0 0);
border-bottom-color: hsl(100deg 50% 25% / 75%);
border-bottom-color: currentColor;
border-bottom-color: transparent;

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

Values

This property is specified as one value:

color: The color of the bottom border.

Formal definition

Initial value	currentcolor
Applies to	all elements
Inherited	no
Computed value	computed color
Animation type	a <a href="/en-US/docs/Web/CSS/Reference/Values/color_value#interpolation" title="Values of the <color> CSS data type are interpolated on each of their red, green, blue components, each handled as a real, floating-point number. Note that interpolation of colors happens in the alpha-premultiplied sRGBA color space to prevent unexpected grey colors to appear.">color</a>

Formal syntax

border-bottom-color = 
  <'border-top-color'>

Examples

A div with a border

HTML

<div class="my-box">
  <p>
    This is a box with a border around it. Note which side of the box is
    <span class="red-text">red</span>.
  </p>
</div>

CSS

.my-box {
  border: solid 0.3em gold;
  border-bottom-color: red;
  width: auto;
}

.red-text {
  color: red;
}

Result

Specifications

Specification
CSS Backgrounds and Borders Module Level 3 # border-color

Browser compatibility

	Desktop					Mobile
	Chrome	Edge	Firefox	Opera	Safari	Chrome Android	Firefox for Android	Opera Android	Safari on iOS	Samsung Internet	WebView Android	WebView on iOS
`border-bottom-color`	1	12	1	3.5	1	18	4	10.1	1	1.0	4.4	1
`currentColor`	1	12	1.5	9.5	4	18	4	14	3.2	1.0	37	3.2
`transparent`	1	12	1	15	1	18	4	14	1	1.0	4.4	1