CSS border-bottom

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The CSS border-bottom property is a shorthand property for setting the width, style, and color of the bottom border of a box.

Syntax

Possible Values

line-width: Sets the width of the bottom border. See the border-bottom-width property.
line-style: Sets the style of the bottom border. See the border-bottom-style property.
color: Sets the color of the bottom border. See the border-bottom-color property.

In addition, all CSS properties also accept the following CSS-wide keyword values as the sole component of their property value:

initial: Represents the value specified as the property's initial value.
inherit: Represents the computed value of the property on the element's parent.
unset: This value acts as either inherit or initial, depending on whether the property is inherited or not. In other words, it sets all properties to their parent value if they are inheritable or to their initial value if not inheritable.

General Information

Initial Value

This is based on the individual properties' values. Their initial values are as follows:

border-bottom-width: medium
border-bottom-style: none
border-bottom-color: Uses currentColor (which is the value of the color property).

Applies To

All elements.

Inherited?

Media

Visual

Animatable

Yes (see example)

Example Code

Official Specifications

CSS Backgrounds and Borders Module Level 3 (W3C Candidate Recommendation Draft, 11 March 2024)
CSS Level 2.1 (W3C Recommendation 07 June 2011)
CSS Level 1 (W3C Recommendation 17 Dec 1996)

Browser Support

Browser support for CSS properties can vary, particularly for newer or experimental features. Check current browser compatibility before using a property in production, especially when supporting older browsers.

Initial Value

CSS properties have an initial value that applies when the property has not been explicitly set. The initial value is different from the value inherited from a parent element and may vary between properties.

Inheritance

Some CSS properties inherit their computed value from their parent element by default, while others do not. The inherit, initial, unset, and revert keywords can also be used to control how a property gets its value.

Vendor Prefixes

Most modern CSS properties use the standard, unprefixed syntax. Vendor-prefixed properties such as -webkit- are mainly relevant to older browser versions or specific features and should only be used when required by your browser support targets.