CSS border-style

The CSS border-style property allows you to set the border style on all sides of an element.

You can supply from one to four values. Each value specifies the style for each side of the element.

For example, if four values are provided, they will apply to the top, right, bottom and left borders (in that order). Supplying one value applies the style to all four sides. Supplying three values applies the styles to top, left and right, and bottom (in that order).

Syntax

border-style: <line-style>{1,4}

Where

<line-style> = none | hidden | dotted | dashed | solid | double | groove | ridge | inset | outset

Details on these values below.

Possible Values

none

No border. Color and width are ignored. Therefore, the border's width is 0, and the initial value of border-image-width will also resolve to zero.

hidden
Same as none, but in the collapsing border model (border-collapsed tables), also inhibits any other border. In other words, when multiple edges come together with different border settings (for example, a table and a td, each with their own border settings), if any one of those is hidden, it will prevent any border at that edge. This is different to none, in that all elements meeting that edge must have none before the border is omitted.
dotted
A series of round dots.
dashed
A series of square-ended dashes.
solid
A single line segment.
double
Two parallel solid lines with some space between them. When using this value, the border-width value determines the sum of the lines and the space between them.
groove
Looks as if it were carved in the canvas.
ridge
Looks as if it were coming out of the canvas.
inset
Looks as if the content on the inside of the border is sunken into the canvas. Treated as ridge in the collapsing border model.
outset
Looks as if the content on the inside of the border is coming out of the canvas. Treated as groove in the collapsing border model.

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
none (based on the intial value of the individual properties).
Applies To
All elements.
Inherited?
No
Media
Visual

Example Code

div {
  border-style: dotted dashed solid double;
  }

Official Specifications