The border
CSS property sets an element's border. It's a shorthand for border-width
, border-style
, and border-color
.
As with all shorthand properties, any omitted sub-values will be set to their initial value. Importantly, border
cannot be used to specify a custom value for border-image
, but instead sets it to its initial value, i.e., none
.
The border
shorthand is especially useful when you want all four borders to be the same. To make them different from each other, however, you can use the longhand border-width
, border-style
, and border-color
properties, which accept different values for each side. Alternatively, you can target one border at a time with the physical (e.g., border-top
) and logical (e.g., border-block-start
) border properties.
Borders and outlines are very similar. However, outlines differ from borders in the following ways:
/* style */ border: solid; /* width | style */ border: 2px dotted; /* style | color */ border: outset #f33; /* width | style | color */ border: medium dashed green; /* Global values */ border: inherit; border: initial; border: unset;
The border
property may be specified using one, two, or three of the values listed below. The order of the values does not matter.
Note: The border will be invisible if its style is not defined. This is because the style defaults to none
.
<line-width>
medium
if absent. See border-width
.<line-style>
none
if absent. See border-style
.<color>
currentcolor
if absent. See border-color
.<line-width> || <line-style> || <color>where
<line-width> = <length> | thin | medium | thick
<line-style> = none | hidden | dotted | dashed | solid | double | groove | ridge | inset | outset
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>where
<rgb()> = rgb( <percentage>{3} [ / <alpha-value> ]? ) | rgb( <number>{3} [ / <alpha-value> ]? ) | rgb( <percentage>#{3} , <alpha-value>? ) | rgb( <number>#{3} , <alpha-value>? )
<rgba()> = rgba( <percentage>{3} [ / <alpha-value> ]? ) | rgba( <number>{3} [ / <alpha-value> ]? ) | rgba( <percentage>#{3} , <alpha-value>? ) | rgba( <number>#{3} , <alpha-value>? )
<hsl()> = hsl( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsl( <hue>, <percentage>, <percentage>, <alpha-value>? )
<hsla()> = hsla( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsla( <hue>, <percentage>, <percentage>, <alpha-value>? )where
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>
<div>I have a border, an outline, AND a box shadow! Amazing, isn't it?</div>
div { border: 0.5rem outset pink; outline: 0.5rem solid khaki; box-shadow: 0 0 0 2rem skyblue; border-radius: 12px; font: bold 1rem sans-serif; margin: 2rem; padding: 1rem; outline-offset: 0.5rem; }
Specification | Status | Comment |
---|---|---|
CSS Backgrounds and Borders Module Level 3 The definition of 'border' in that specification. | Candidate Recommendation | Removes specific support for transparent , as it is now a valid <color> ; this has no practical impact.Though it cannot be set to a custom value using the shorthand, border now resets border-image to its initial value (none ). |
CSS Level 2 (Revision 1) The definition of 'border' in that specification. | Recommendation | Accepts the inherit keyword. Also accepts transparent as a valid color. |
CSS Level 1 The definition of 'border' in that specification. | Recommendation | Initial definition. |
Initial value | as each of the properties of the shorthand:
|
---|---|
Applies to | all elements. It also applies to ::first-letter . |
Inherited | no |
Media | visual |
Computed value | as each of the properties of the shorthand:
|
Animation type | as each of the properties of the shorthand:
|
Canonical order | order of appearance in the formal grammar of the values |
Desktop | ||||||
---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
Basic support | 1 | 12 | 1 | 4 | 3.5 | 1 |
Mobile | |||||||
---|---|---|---|---|---|---|---|
Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
Basic support | ? | ? | Yes | 4 | ? | 1 | ? |
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https://developer.mozilla.org/en-US/docs/Web/CSS/border