CSS border-right-width Property

The border-right-width property is used to define the width of an element’s right border. The right border width, as well as all the other border sides, can also be defined with the border or border-width shorthand properties.

For setting the border-right-width you should first define the border-style property, because you need borders before setting its width. The border-right-style or border-style can be used to specify the border's style.

The specification doesn't define the exact thickness of each keyword. However, they always follow this order: thin ≤ medium ≤ thick.

The specification does not define how borders of different width and styles connect in the corners.

Initial Value medium
Applies to All elements. It also applies to ::first-letter.
Inherited No
Animatable Yes. The width of the border is animatable.
Version CSS1
DOM Syntax object.style.borderRightWidth = "5px";

Syntax

border-right-width: medium | thin | thick | length | initial | inherit;

Example of the border-right property:

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      p {
      padding: 8px;    
      width: 50%;         
      border-style: dotted;
      border-right-width: thick;
      }
    </style>
  </head>
  <body>
    <h2>Border-right-width example</h2>
    <p>As you can see the width of the right border is set to thick.</p>
  </body>
</html>

Example of the border-right property with all the values:

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      body {
      background: #ccc;
      font-size: 20px;
      text-align: center;
      }
      main div {
      display: flex;
      align-items: center;      
      justify-content: center;
      color: black;
      padding-top: 30px;
      padding-bottom: 30px;
      width: 200px;
      height: 100px;
      margin: 15px;
      font-weight: bold;
      border: solid;
      }
      .flex-center {
      display: flex;
      justify-content: center;
      }
      /* border-right-width example classes */
      .b1 {border-right-width: medium;}
      .b2 {border-right-width: thin;}
      .b3 {border-right-width: thick;}
      .b4 {border-right-width: 10px;}
      .b5 {border-right-width: initial;}
      .b6 {border-right-width: inherit;}
    </style>
  </head>
  <body>
    <h2>Border-right-width value examples</h2>
    <main class="flex-center">
      <div class="b1">
        medium
      </div>
      <div  class="b2">
        thin
      </div>
      <div  class="b3">
        thick
      </div>
    </main>
    <main class="flex-center">
      <div  class="b4">
        10px lenght
      </div>
      <div class="b5">
        initial
      </div>
      <div class="b6">
        inherit
      </div>
    </main>
    </div>
    </main>
  </body>
</html>

Result

Values

Value Description
medium Defines medium right border. It is the default value of this property.
thin Defines a thin right border. It is up to the user agent to determine the exact width.
thick Defines a thick right border. It is up to the user agent to determine the exact width.
length Defines the the thickness length of the right border. For example, 10px, 5em, 8pt, etc.
initial Sets the property to its default value.
inherit Inherits the property from its parent element.

Browser support

1.0+ 12.0+ 1.0+ 1.0+ 3.5+


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