Appearance:
border-style: <value>
Possible Values:
[ none | dotted | dashed | solid | double | groove | ridge | inset | outset ]{1,4}
Initial Value:
none
Applies to:
All elements
Inherited:
No

The border-style property sets the style of an element's border. This property must be specified for the border to be visible.

Between one and four keywords are specified. If four values are given, they apply to top, right, bottom, and left border style, 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.

One may also use the border shorthand property.

examples:

border-style
none

border-style
dotted

border-style
dashed

border-style
solid

border-style
double

border-style
groove

border-style
ridge

border-style
inset

border-style
outset