border-right-width

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

The border-right-widthCSS property sets the width of the right border of an element.

Try it

border-right-width: thick; 
border-right-width: 2em; 
border-right-width: 4px; 
border-right-width: 2ex; 
border-right-width: 0; 
<section class="default-example" id="default-example"> <div class="transition-all" id="example-element"> This is a box with a border around it. </div> </section> 
#example-element { background-color: palegreen; color: #000; border: 0 solid crimson; padding: 0.75em; width: 80%; height: 100px; }

Syntax

css
/* Keyword values */ border-right-width: thin; border-right-width: medium; border-right-width: thick; /* <length> values */ border-right-width: 10em; border-right-width: 3vmax; border-right-width: 6px; /* Global keywords */ border-right-width: inherit; border-right-width: initial; border-right-width: revert; border-right-width: revert-layer; border-right-width: unset;

Values

<line-width>

Defines the width of the border, either as an explicit nonnegative <length> or a keyword. If it's a keyword, it must be one of the following values:

  • thin
  • medium
  • thick

Note: Because the specification doesn't define the exact thickness denoted by each keyword, the precise result when using one of them is implementation-specific. Nevertheless, they always follow the pattern thin ≤ medium ≤ thick, and the values are constant within a single document.

Formal definition

Initial valuemedium
Applies toall elements. It also applies to ::first-letter.
Inheritedno
Computed valuethe absolute length or 0 if border-right-style is none or hidden
Animation typea length

Formal syntax

border-right-width = 
<line-width>

<line-width> = 
<length [0,∞]>|
thin|
medium|
thick

Examples

Comparing border widths

HTML

html
<div>Element 1</div> <div>Element 2</div>

CSS

css
div { border: 1px solid red; margin: 1em 0; } div:nth-child(1) { border-right-width: thick; } div:nth-child(2) { border-right-width: 2em; }

Result

Specifications

Specification
CSS Backgrounds and Borders Module Level 3
# the-border-width

Browser compatibility

See also