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border-bottom-color

Theborder-bottom-color CSS property sets the color of an element's bottom border. Note that in many cases the shorthand CSS properties border-color or border-bottom are more convenient and preferable.

/* <color> values */
border-bottom-color: red;
border-bottom-color: #ffbb00;
border-bottom-color: rgb(255, 0, 0);
border-bottom-color: hsla(100%, 50%, 25%, 0.75);
border-bottom-color: currentColor;
border-bottom-color: transparent;

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

Initial value	`currentcolor`
Applies to	all elements. It also applies to `::first-letter`.
Inherited	no
Media	visual
Computed value	computed color
Animation type	a color
Canonical order	the unique non-ambiguous order defined by the formal grammar

Syntax

The border-bottom-color property is specified as a single value.

Values

<color>: The color of the bottom border.

Formal syntax

<color>where 
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
where 
<rgb()> = rgb( [ [ <percentage>{3} | <number>{3} ] [ / <alpha-value> ]? ] | [ [ <percentage>#{3} | <number>#{3} ] , <alpha-value>? ] )
<rgba()> = rgba( [ [ <percentage>{3} | <number>{3} ] [ / <alpha-value> ]? ] | [ [ <percentage>#{3} | <number>#{3} ] , <alpha-value>? ] )
<hsl()> = hsl( [ <hue> <percentage> <percentage> [ / <alpha-value> ]? ] | [ <hue>, <percentage>, <percentage>, <alpha-value>? ] )
<hsla()> = hsla( [ <hue> <percentage> <percentage> [ / <alpha-value> ]? ] | [ <hue>, <percentage>, <percentage>, <alpha-value>? ] )
where 
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>

Examples

A simple div with a border

HTML

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

CSS

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

.redtext {
  color: red;
}

Result

Specifications

Specification	Status	Comment
CSS Backgrounds and Borders Module Level 3 The definition of 'border-bottom-color' in that specification.	Candidate Recommendation	No significant changes, though the `transparent` keyword, now included in `<color>` which has been extended, has been formally removed.
CSS Level 2 (Revision 1) The definition of 'border-bottom-color' in that specification.	Recommendation	Initial definition

Browser Compatibility

Feature	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari
Basic support	1	Yes	1¹	4	3.5	1

Feature	Android webview	Chrome for Android	Edge mobile	Firefox for Android	IE mobile	Opera Android	iOS Safari
Basic support	1	?	Yes	4¹	6.5	11	1

1. Firefox also supports the non-standard -moz-border-bottom-colors CSS property that sets the bottom border to multiple colors.