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CSS: border-bottom-width property

This CSS tutorial explains how to use the CSS property called border-bottom-width with syntax and examples.

Description

The CSS border-bottom-width property defines the width of the bottom border of a box.

Syntax

The syntax for the border-bottom-width CSS property is:

border-bottom-width: value;

Parameters or Arguments

value

The width of the bottom border of a box. It can be one of the following:

Value Description
fixed Fixed value expressed in px, em, ...
div { border-bottom-width: 2px; }
thin Thin border width, which might be 1px or 2px depending on the browser
div { border-bottom-width: thin; }
medium Medium border width, which might be 3px or 4px depending on the browser
div { border-bottom-width: medium; }
thick Thick border width, which might be 5px or 6px depending on the browser
div { border-bottom-width: thick; }

Note

Browser Compatibility

The CSS border-bottom-width property has basic support with the following browsers:

  • Chrome
  • Android
  • Firefox (Gecko)
  • Firefox Mobile (Gecko)
  • Internet Explorer (IE)
  • IE Phone
  • Opera
  • Opera Mobile
  • Safari (WebKit)
  • Safari Mobile

Example

We will discuss the border-bottom-width property below, exploring examples of how to use this property in CSS.

Let's look at an example where we set the bottom border to a fixed width.

div { border-bottom-width: 2px; border-bottom-style: solid; }

In this CSS border-bottom-style example, we have set the width of the bottom border to 2px. Be sure to apply a border-bottom-style so that the border appears.

Next, let's try using one of the width keywords (thin, medium, thick) to set our bottom border width.

div { border-bottom-width: thick; border-bottom-style: solid; }

In this border-bottom-style example, we have set the bottom border to a thick line.

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