CSS border-block-color Property

CSS border-block-color

The border-block-color property in CSS specifies the color of an element’s block-start and block-end borders. The block-start and block-end sides depend on the writing mode, directionality, and text orientation of the element. This property allows you to set different or the same colors for the block-start and block-end borders.

Syntax of border-block-color

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border-block-color: color | transparent | initial | inherit;

Values

Value	Description
`color`	Specifies the color of the block-start and block-end borders. Accepts any valid CSS color value (e.g., `red`, `#ff0000`, `rgba(255,0,0,0.5)`).
`transparent`	Makes the block-start and block-end borders fully transparent.
`initial`	Sets the property to its default value (currentColor).
`inherit`	Inherits the value from the parent element.

Default Value

currentColor (inherits the current text color)

Examples for border-block-color

Using the CSS border-block-color Property

The following examples demonstrate how to use the border-block-color property to set border colors for the block-start and block-end sides.

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/* Set the same color for block-start and block-end borders */
.element {
  border-block-color: blue;
}

/* Set different colors for block-start and block-end borders */
.element {
  border-block-color: blue green;
}

/* Set the block borders to transparent */
.element {
  border-block-color: transparent;
}

/* Inherit the block border colors from the parent */
.element {
  border-block-color: inherit;
}

Example for Red Color Block Border

Below is an example demonstrating how to use border-block-color: red to set red for the block-start border and red for the block-end border:

index.html

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<!DOCTYPE html>
<html lang="en">
<head>
<style>
  .box {
    width: 300px;
    padding: 10px;
    border-block: 5px solid;
    border-block-color: red;
  }
</style>
</head>
<body>

<h2 class="box">Lorem Ipsum</h2>

</body>
</html>

Example for Different Block Border Colors

Below is an example demonstrating how to use border-block-color: red green to set red for the block-start border and green for the block-end border:

index.html

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<!DOCTYPE html>
<html lang="en">
<head>
<style>
  .box {
    width: 300px;
    padding: 10px;
    border-block: 5px solid;
    border-block-color: red green;
  }
</style>
</head>
<body>

<h2 class="box">Lorem Ipsum</h2>

</body>
</html>

Browser Support

The border-block-color property is supported in modern browsers. Below is a compatibility table:

Browser	Version
Chrome	87.0
Edge	87.0
Firefox	66.0
Safari	14.1
Opera	73.0

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CSS border-block-color Property