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CSS border-width Property

Last Updated : 11 Jul, 2025
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The border-width property in CSS sets the width of an element’s border. You can specify a single width for all four sides or define different widths for each side (top, right, bottom, and left).

This property is crucial for creating visually appealing borders and enhancing the layout of your web pages.

Syntax

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

Default Value: medium

Property values

Value Description
length Sets border width; cannot be negative.
thin Sets a thin border at the element's top.
medium Sets medium-sized top border; default value.
thick Sets thick top border.
initial Sets border-top-width to default value.
inherit Inherits border-top-width from parent element.

CSS border-width property is a shorthand for the following CSS properties:

Property Description
border-top-width Specifies the width of the top border of an element.
border-bottom-width Determines the width of the bottom border of an element.
border-left-width Sets the width of the left border of an element.
border-right-width Specifies the width of the right border of an element.
border-block-width Sets the width of the borders on the block-start and block-end sides of an element.
border-inline-width Sets the width of the borders on the inline-start and inline-end sides of an element.

CSS border-width Property Examples

This example sets the same border width on all four sides of the element.

Example 1: Applying a Single Value

This example sets the same border width on all four sides of the element.

HTML 
<!DOCTYPE html>
<html>

<head>
    <title>
        border-width property - Single Value
    </title>
    <style>
        div {
            margin-bottom: 10px;
            border-style: solid;
            border-color: red;
        }
    </style>
</head>

<body>
    <h1 style="color: green">
        GeeksforGeeks
    </h1>
    <p>border-width: 5px</p>

    <!-- This div has a uniform border of 5px around it -->
    <div style="border-width: 5px">
        This div has a border around it of 5px on all sides.
    </div>
</body>

</html>
Applying a Single Value

Explanation:

In this example, the border-width: 5px sets a 5px border for all four sides of the div element. The border is styled solid and colored red.

Example 2: Two Values for Different Sides

This example applies one value for the top/bottom borders and another for the left/right borders.

HTML 
<!DOCTYPE html>
<html>

<head>
    <title>
        border-width property - Two Values
    </title>
    <style>
        div {
            margin-bottom: 10px;
            border-style: solid;
            border-color: green;
        }
    </style>
</head>

<body>
    <h1 style="color: green">
        GeeksforGeeks
    </h1>
    <p>border-width: 5px 10px</p>

    <!-- This div has a 5px top/bottom border and 10px left/right border -->
    <div style="border-width: 5px 10px">
        This div has a border of 5px for the top/bottom and 10px for the left/right.
    </div>
</body>

</html>

Output:

Two-Values-for-Different-Sides
Output

Explanation:

Here, border-width: 5px 10px sets the top and bottom borders to 5px and the left and right borders to 10px. This applies two different widths to specific sides of the element.

Example 3: Three Values for Targeting Specific Sides

This example uses three values for different sides: one for the top, one for the right/left, and one for the bottom.

HTML 
<!DOCTYPE html>
<html>

<head>
    <title>
        border-width property - Three Values
    </title>
    <style>
        div {
            margin-bottom: 10px;
            border-style: solid;
            border-color: blue;
        }
    </style>
</head>

<body>
    <h1 style="color: green">
        GeeksforGeeks
    </h1>
    <p>border-width: 5px 10px 15px</p>

    <!-- This div has 5px for the top, 10px for the right/left, and 15px for the bottom -->
    <div style="border-width: 5px 10px 15px">
        This div has a border of 5px for the top, 10px for the right/left, and 15px for the bottom.
    </div>
</body>

</html>

Output:

Output
Output

Explanation:

The border-width: 5px 10px 15px rule sets the top border to 5px, the right and left borders to 10px, and the bottom border to 15px. This creates varying thickness on different sides of the element.

Example 4: Four Values for Each Side

In this final example, four different values are applied to each side of the border.

HTML 
<!DOCTYPE html>
<html>

<head>
    <title>
        border-width property - Four Values
    </title>
    <style>
        div {
            margin-bottom: 10px;
            border-style: solid;
            border-color: black;
        }
    </style>
</head>

<body>
    <h1 style="color: green">
        GeeksforGeeks
    </h1>
    <p>border-width: 5px 10px 15px 20px</p>

    <!-- This div has different border widths for each side -->
    <div style="border-width: 5px 10px 15px 20px">
        This div has a border of 5px for the top, 10px for the right, 15px for the bottom, and 20px for the left.
    </div>
</body>

</html>

Output:

Output
Output

Supported Browsers

The browser supported by border-width property are listed below:

Note: Always check for the latest browser versions to ensure full compatibility with the most recent CSS features.


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