출처: http://www.w3schools.com/css/css_border.asp

border-style values:

none: Defines no border

dotted: Defines a dotted border

dashed: Defines a dashed border

solid: Defines a solid border

double: Defines two borders. The width of the two borders are the same as the border-width value

groove: Defines a 3D grooved border. The effect depends on the border-color value

ridge: Defines a 3D ridged border. The effect depends on the border-color value

inset: Defines a 3D inset border. The effect depends on the border-color value

outset: Defines a 3D outset border. The effect depends on the border-color value

Try it yourself: Set the style of the border

The border-style property can have from one to four values.

• border-style:dotted solid double dashed;
  • top border is dotted
  • right border is solid
  • bottom border is double
  • left border is dashed
  
  
• border-style:dotted solid double;
  • top border is dotted
  • right and left borders are solid
  • bottom border is double
  
  
• border-style:dotted solid;
  • top and bottom borders are dotted
  • right and left borders are solid
  
  
• border-style:dotted;
  • all four borders are dotted

The border-style property is used in the example above. However, it also works with border-width and border-color.

Border - Shorthand property

As you can see from the examples above, there are many properties to consider when dealing with borders.

To shorten the code, it is also possible to specify all the individual border properties in one property. This is called a shorthand property.

The border property is a shorthand for the following individual border properties:

• border-width
• border-style (required)
• border-color

All CSS Border Properties

CSS Border

Set the width of the four borders
Set the width of the top border
Set the width of the bottom border
Set the width of the left border
Set the width of the right border

Set the style of the four borders
Set the style of the top border
Set the style of the bottom border
Set the style of the left border
Set the style of the right border

Set the color of the four borders
Set the color of the top border
Set the color of the bottom border
Set the color of the left border
Set the color of the right border

All the border properties in one declaration

Set different borders on each side
All the top border properties in one declaration
All the bottom border properties in one declaration
All the left border properties in one declaration
All the right border properties in one declaration

Border properties explained