This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

In Mozilla applications like Firefox, the -moz-border-bottom-colors CSS property sets a list of colors for the bottom border.

When an element has a border that is larger than a single CSS pixel, each line of pixels uses the next color specified in this property, from the outside in. This eliminates the need for nested boxes. If the border is wider than the number of specified colors, the remaining part of the border is the innermost color specified.

Initial valuenone
Applies toall elements
Computed valueas specified
Canonical orderthe unique non-ambiguous order defined by the formal grammar

It does not apply

  1. if border-style is dashed or dotted.
  2. to tables with border-collapse: collapse.


/* Single <color> value */
-moz-border-bottom-colors: #f0f0f0;

/* Multiple <color> values */
-moz-border-bottom-colors: #f0f0f0 #a0a0a0 #505050 #000000;

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


Accepts a white-space separated list of color values.

Specifies the color of a line of pixels of the bottom border. transparent is valid. See <color> values for possible units.
Default, no colors are drawn or border-color is used, if specified.

Formal syntax

[<color>]* <color> | none

<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>

<rgb()> = rgb( <rgb-component>#{3} )
<rgba()> = rgba( <rgb-component>#{3} , <alpha-value> )
<hsl()> = hsl( <hue>, <percentage>, <percentage> )
<hsla()> = hsla( <hue>, <percentage>, <percentage>, <alpha-value> )
<named-color> = <ident>
<deprecated-system-color> = ActiveBorder | ActiveCaption | AppWorkspace | Background | ButtonFace | ButtonHighlight | ButtonShadow | ButtonText | CaptionText | GrayText | Highlight | HighlightText | InactiveBorder | InactiveCaption | InactiveCaptionText | InfoBackground | InfoText | Menu | MenuText | Scrollbar | ThreeDDarkShadow | ThreeDFace | ThreeDHighlight | ThreeDLightShadow | ThreeDShadow | Window | WindowFrame | WindowText

<rgb-component> = <integer> | <percentage>
<alpha-value> = <number>
<hue> = <number>


<div id="example">Example</div>
#example {
  padding: 20px;
  background-color: gray;
  border: 10px solid black;
  -moz-border-top-colors: #e00 #c30 #c50 #c60 #c70 #c80 #c90 #ca0 #cb0 #cc0;
  -moz-border-right-colors: red #f60 #f80 #f90 #fa0 #fb0 #fc0 #fd0 #fe0 #ff0;
  -moz-border-bottom-colors: red #f60 #f80 #f90 #fa0 #fb0 #fc0 #fd0 #fe0 #ff0;
  -moz-border-left-colors: #e00 #c30 #c50 #c60 #c70 #c80 #c90 #ca0 #cb0 #cc0;


This property is not part of any specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support 1.0 (1.7 or earlier) No support No support No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support No support ? No support No support No support

See also

Document Tags and Contributors

 Last updated by: Sebastianz,