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Border Width

Syntax: border-width: <value>
Possible Values: [ thin | medium | thick | <length> ]{1,4}
Initial Value: Not defined
Applies to: All elements
Inherited: No

The border-width property is used to set the border width of an element by specifying between one and four values, where each value is a keyword or a length. Negative lengths are not permitted.

If four values are given, they apply to top, right, bottom, and left border width, respectively. If one value is given, it applies to all sides. If two or three values are given, the missing values are taken from the opposite side.

This property is a shorthand for the border-top-width, border-right-width, border-bottom-width, and border-left-width properties.

Authors may also use the border shorthand property.