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Using Border in CSS

Reading time 1 min
Published Sep 8, 2017
Updated Oct 10, 2019

Defining border in CSS

The CSS border property allows you to define a line border for an element:

Example
h1 {
   border: 5px solid red;
}
a {
   border: 2px solid green; 
}

It is actually a shorthand for three CSS line border subproperties:

Working with border: CSS syntax

To define a line border in CSS, follow the syntax example below:

border: width style color;

The available values will be explained in the following section.

Property values

Value Description Defined in Default value
width CSS border width Length units or keywords (thin, medium, thick) medium
style CSS border style Keywords (none, solid, hidden, dashed, dotted, double, groove, ridge, inset, outset) none
color CSS border color Color names, RGB, RGBA, HEX, HSL or HSLA values. currentcolor

Note: you don't need to define all of the subproperties for line borders necessarily. The order is also not important.

Browser support

Browser image
Chrome
1+
Browser image
Edge
12+
Browser image
Firefox
1+
Browser image
IE
4+
Browser image
Opera
3.5+
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Safari
1+

Mobile browser support

Browser image
Chrome
18+
Browser image
Firefox
4+
Browser image
Safari
1+