Use named colors, hexadecimal values, RGB, RGBA, HSL, or HSLA to customize the appearance.
Learn about syntax, values, and examples.
Introduction
The border-bottom-color
CSS property sets the color of an element’s bottom border. It’s great for customizing the look of your web elements. You can use various color formats like named colors, hexadecimal values, RGB, RGBA, HSL, and HSLA. Additionally, you can use shorthand properties like border-color
or border-bottom
for efficiency.
Customizing the bottom border color can enhance the visual appeal of your website, making sections like headers, footers, or navigation menus stand out.
Syntax
The border-bottom-color
property is defined using a single color value. You can use named colors, hexadecimal values, RGB, RGBA, HSL, HSLA, or global values like inherit
, initial
, revert
, revert-layer
, and unset
.
Values
The border-bottom-color
property accepts various values to define the color of the bottom border:
Color Values
- Named Colors:
red
,blue
,green
, etc. - Hexadecimal Colors:
#ffbb00
- RGB Colors:
rgb(255, 0, 0)
- RGBA Colors:
rgba(255, 0, 0, 0.5)
- HSL Colors:
hsl(100deg, 50%, 25%)
- HSLA Colors:
hsla(100deg, 50%, 25%, 0.75)
currentcolor
: Uses the current text color of the element.transparent
: Makes the bottom border transparent.
Global Values
inherit
: Inherits the value from the parent element.initial
: Sets the property to its initial value.revert
: Reverts the property to the default value defined by the user agent stylesheet.revert-layer
: Reverts to the value as defined by the cascade layer.unset
: Resets the property to its natural value.
Formal Definition
The border-bottom-color
property is formally defined in the CSS Backgrounds and Borders Module Level 3. Here are the key aspects:
- Initial Value:
currentcolor
- Applies To: All elements, including the
::first-letter
pseudo-element. - Inherited: No
- Computed Value: The computed color
- Animation Type: Color
Formal Syntax
The formal syntax of the border-bottom-color
property is:
Examples
Here are some practical examples to help you understand how to use the border-bottom-color
property.
Example 1: Basic Usage
HTML:
CSS:
Result: This creates a box with a gold border, but the bottom border is red.
Example 2: Using Hexadecimal Color
HTML:
CSS:
Result:
This creates a box with a black border, but the bottom border has a color specified by the hexadecimal value #ffbb00
.
Example 3: Using RGB Color
HTML:
CSS:
Result:
This creates a box with a black border, but the bottom border has a color specified by the RGB value rgb(255, 0, 0)
.
Example 4: Using HSL Color
HTML:
CSS:
Result:
This creates a box with a black border, but the bottom border has a color specified by the HSL value hsl(100deg, 50%, 25%)
.
Example 5: Using Transparent Color
HTML:
CSS:
Result: This creates a box with a black border, but the bottom border is transparent.
Example 6: Using Global Values
HTML:
CSS:
Result: This creates a box with a black border, and the bottom border color is inherited from the parent element.
Specifications
The border-bottom-color
property is part of the CSS Backgrounds and Borders Module Level 3, which defines the behavior and rules for borders in web design. This module is developed by the CSS Working Group and is widely supported across different web browsers.
Browser Compatibility
The border-bottom-color
property is well-supported across modern web browsers:
- Google Chrome: Fully supported since version 1.0.
- Mozilla Firefox: Fully supported since version 1.0.
- Internet Explorer: Supported since version 4.0.
- Microsoft Edge: Fully supported since version 12.0.
- Opera: Fully supported since version 3.5.
- Safari: Fully supported since version 1.0.
For the most accurate and up-to-date information, refer to resources like the Browser Compatibility Data (BCD) tables on MDN Web Docs.
See Also
To further enhance your understanding and usage of the border-bottom-color
property, you may find the following related CSS properties and resources helpful:
border-top-color
border-left-color
border-right-color
border-color
border-bottom
Border-related CSS Shorthand Properties
border
: Sets all border properties (width, style, color).border-bottom
: Sets the bottom border’s width, style, and color.border-color
: Sets the color of all four borders.
Color-related CSS Properties for Other Borders
border-right-color
: Sets the right border color.border-top-color
: Sets the top border color.border-left-color
: Sets the left border color.
Other Border-related CSS Properties
border-bottom-style
: Sets the bottom border style.border-bottom-width
: Sets the bottom border width.
Default Color Value
currentcolor
: Represents the current text color.
FAQs
What is the border-bottom-color
property in CSS?
The border-bottom-color
property sets the color of an element’s bottom border.
How do I set a gradient color for the bottom border?
border-bottom-color
only supports solid colors. For a gradient effect, use a pseudo-element like ::before
or ::after
with a gradient background positioned at the bottom.
Can I use transparent or semi-transparent colors with border-bottom-color
?
Yes, you can use RGBA or HSLA values. For example, border-bottom-color: rgba(0, 0, 0, 0.5);
creates a semi-transparent black bottom border.
What is the default value of border-bottom-color
?
The default value is the element’s current color, inherited from the color
property unless explicitly set.
Why is the color of my bottom border different from what I set?
This could be due to conflicts with higher specificity styles, inheritance issues, or browser quirks. Check your CSS rules for overriding styles.
Is the border-bottom-color
property animatable?
Yes, border-bottom-color
is animatable. It interpolates between color values smoothly, allowing for seamless animations.
Can I use border-bottom-color
with pseudo-elements like ::before
and ::after
?
Yes, you can use border-bottom-color
with pseudo-elements like ::before
and ::after
to customize their borders.
How does border-bottom-color
interact with other border properties?
border-bottom-color
works with other border properties like border-bottom-style
and border-bottom-width
to define the complete appearance of the bottom border.
Is border-bottom-color
supported in all browsers?
border-bottom-color
is well-supported across modern web browsers, including Google Chrome, Mozilla Firefox, Internet Explorer, Microsoft Edge, Opera, and Safari. Always check the latest browser compatibility information.
Can I set the border-bottom-color
using shorthand properties?
Yes, you can set border-bottom-color
using shorthand properties like border-color
or border-bottom
. These allow you to specify multiple border properties in a single declaration, making your CSS more concise.
By understanding these frequently asked questions, you can effectively use the border-bottom-color
property to enhance your web designs.
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