The border-bottom shorthand CSS property sets an element's bottom border. It sets the values of border-bottom-width, border-bottom-style and border-bottom-color.
As with all shorthand properties, border-bottom always sets the values of all of the properties that it can set, even if they are not specified. It sets those that are not specified to their default values. Consider the following code:
border-bottom-style: dotted; border-bottom: thick green;
It is actually the same as this one:
border-bottom-style: dotted; border-bottom: none thick green;
The value of border-bottom-style given before border-bottom is ignored. Since the default value of border-bottom-style is none, not specifying the border-style part results in no border.
Constituent properties
This property is a shorthand for the following CSS properties:
Syntax
border-bottom: 1px; border-bottom: 2px dotted; border-bottom: medium dashed blue; /* Global values */ border-bottom: inherit; border-bottom: initial; border-bottom: revert; border-bottom: revert-layer; border-bottom: unset;
The three values of the shorthand property can be specified in any order, and one or two of them may be omitted.
Values
<br-width>-
See
border-bottom-width. <br-style>-
See
border-bottom-style. <color>-
See
border-bottom-color.
Examples
Applying a bottom border
HTML
<div>This box has a border on the bottom side.</div>
CSS
div {
border-bottom: 4px dashed blue;
background-color: gold;
height: 100px;
width: 100px;
font-weight: bold;
text-align: center;
}