CSS column-rule-width Property

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The column-rule-width CSS property defines the width of the rule between columns. The column-rule-width property is one of the CSS3 properties.

Firstly you should define columns or column-rule-style property then the column-rule-width property. An element must have some rules before you can set the width.

This property has the following values:

medium
thick
thin
length

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

Initial Value	medium
Applies to	Multicol elements.
Inherited	No.
Animatable	Yes. The width and color of the rule are animatable.
Version	CSS3
DOM Syntax	object.style.columnRuleWidth = "5px";

Syntax

column-rule-width: medium | thin | thick | length | initial | inherit;

Example of the column-rule-width property:

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      div {
        /* Chrome, Safari, Opera */
        -webkit-column-count: 3;
        -webkit-column-gap: 40px;
        -webkit-column-rule-style: dotted;
        -webkit-column-rule-color: #666;
        -webkit-column-rule-width: thick;
        /* Firefox */
        -moz-column-count: 3;
        -moz-column-gap: 40px;
        -moz-column-rule-style: dotted;
        -moz-column-rule-color: #666;
        -moz-column-rule-width: thick;
        column-count: 3;
        column-gap: 40px;
        column-rule-style: dotted;
        column-rule-color: #666;
        column-rule-width: thick;
        text-align: justify;
      }
    </style>
  </head>
  <body>
    <h1>Column-rule-width property example</h1>
    <div>
      Lorem Ipsum is dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
    </div>
  </body>
</html>

Try it Yourself »

Result

Example of the column-rule-width property with the "thin" value:

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      div {
        /* Chrome, Safari, Opera */
        -webkit-column-count: 3;
        -webkit-column-gap: 40px;
        -webkit-column-rule-style: solid;
        -webkit-column-rule-width: thin;
        /* Firefox */
        -moz-column-count: 3;
        -moz-column-gap: 40px;
        -moz-column-rule-style: solid;
        -moz-column-rule-width: thin;
        column-count: 3;
        column-gap: 40px;
        column-rule-style: solid;
        column-rule-width: thin;
        text-align: justify;
      }
    </style>
  </head>
  <body>
    <h1>Column-rule-width property example</h1>
    <div>
      Lorem Ipsum is dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
    </div>
  </body>
</html>

Try it Yourself »

Example of the column-rule-width property specified as "15px":

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      div {
        /* Chrome, Safari, Opera */
        -webkit-column-count: 3;
        -webkit-column-gap: 40px;
        -webkit-column-rule-style: groove;
        -webkit-column-rule-color: #1c87c9;
        -webkit-column-rule-width: 15px;
        /* Firefox */
        -moz-column-count: 3;
        -moz-column-gap: 40px;
        -moz-column-rule-style: groove;
        -moz-column-rule-color: #1c87c9;
        -moz-column-rule-width: 15px;
        column-count: 3;
        column-gap: 40px;
        column-rule-style: groove;
        column-rule-color: #1c87c9;
        column-rule-width: 15px;
        text-align: justify;
      }
    </style>
  </head>
  <body>
    <h1>Column-rule-width property example</h1>
    <div>
      Lorem Ipsum is dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.
    </div>
  </body>
</html>

Try it Yourself »

Values

Value	Description	Play it
medium	The rule is medium. This is the default value.	Play it »
thick	The rule is thick.	Play it »
thin	The rule is thin.	Play it »
length	Specifies the rule of the width.	Play it »
initial	Sets the property to its default value.	Play it »
inherit	Inherits the property from its parent element.