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Usage of border-bottom-width property in CSS
The border-bottom-width property sets the thickness of an element's bottom border. It only takes effect when border-style is defined, as borders need a style to be visible.
Syntax
border-bottom-width: value;
Values
The property accepts the following values:
- thin - A thin border (typically 1px)
- medium - A medium border (typically 3px)
- thick - A thick border (typically 5px)
- length - Custom width in px, em, rem, etc.
- inherit - Inherits from parent element
Example with Different Widths
<!DOCTYPE html>
<html>
<head>
<style>
.thin-border {
border-bottom-width: thin;
border-style: solid;
border-color: #333;
padding: 10px;
margin: 10px 0;
}
.medium-border {
border-bottom-width: medium;
border-style: solid;
border-color: #333;
padding: 10px;
margin: 10px 0;
}
.thick-border {
border-bottom-width: thick;
border-style: solid;
border-color: #333;
padding: 10px;
margin: 10px 0;
}
.custom-border {
border-bottom-width: 8px;
border-style: solid;
border-color: #333;
padding: 10px;
margin: 10px 0;
}
</style>
</head>
<body>
<p class="thin-border">This has a thin bottom border</p>
<p class="medium-border">This has a medium bottom border</p>
<p class="thick-border">This has a thick bottom border</p>
<p class="custom-border">This has a custom 8px bottom border</p>
</body>
</html>
Important Notes
The border-bottom-width property requires border-style to be set. Without a border style, the width has no visual effect:
<!DOCTYPE html>
<html>
<head>
<style>
.no-style {
border-bottom-width: 10px;
/* No border-style - border won't show */
padding: 10px;
}
.with-style {
border-bottom-width: 10px;
border-style: solid;
border-color: #333;
padding: 10px;
}
</style>
</head>
<body>
<p class="no-style">No visible border (missing border-style)</p>
<p class="with-style">Visible border with style defined</p>
</body>
</html>
Common Use Cases
The property is commonly used for:
- Creating underlines for headings and navigation items
- Adding visual separation between content sections
- Styling form inputs and buttons
- Creating dividers in card layouts
Conclusion
The border-bottom-width property controls the thickness of bottom borders and must be used with border-style. It accepts keyword values (thin, medium, thick) or custom length values for precise control.
Updated on: 2026-03-15T23:18:59+05:30
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