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Usage of border-top-width property in CSS
The border-top-width property in CSS controls the thickness of an element's top border. This property only takes effect when a border style is defined.
Syntax
border-top-width: value;
Property Values
| Value | Description | Example |
|---|---|---|
| thin | Specifies a thin border (typically 1px) | border-top-width: thin; |
| medium | Specifies a medium border (typically 3px) | border-top-width: medium; |
| thick | Specifies a thick border (typically 5px) | border-top-width: thick; |
| length | Defines width in px, em, rem, etc. | border-top-width: 8px; |
Example: Basic Usage
<!DOCTYPE html>
<html>
<head>
<style>
.demo-box {
padding: 20px;
border-style: solid;
border-color: #333;
}
.thin-border {
border-top-width: thin;
}
.medium-border {
border-top-width: medium;
}
.thick-border {
border-top-width: thick;
}
.custom-border {
border-top-width: 8px;
}
</style>
</head>
<body>
<div class="demo-box thin-border">
Thin top border
</div>
<br>
<div class="demo-box medium-border">
Medium top border
</div>
<br>
<div class="demo-box thick-border">
Thick top border
</div>
<br>
<div class="demo-box custom-border">
Custom 8px top border
</div>
</body>
</html>
Example: Different Units
<!DOCTYPE html>
<html>
<head>
<style>
.border-demo {
margin: 10px 0;
padding: 15px;
border-style: solid;
border-color: #007bff;
background-color: #f8f9fa;
}
</style>
</head>
<body>
<div class="border-demo" style="border-top-width: 2px;">
2px top border
</div>
<div class="border-demo" style="border-top-width: 0.5em;">
0.5em top border
</div>
<div class="border-demo" style="border-top-width: 10px;">
10px top border
</div>
</body>
</html>
Key Points
-
border-top-widthrequiresborder-styleto be set for the border to appear - Default value is
medium(typically 3px) - Accepts keywords (thin, medium, thick) and length values (px, em, rem, etc.)
- Zero width (
0) removes the top border entirely - Negative values are not allowed
Conclusion
The border-top-width property provides precise control over the top border thickness. Remember to define border-style for the width to take effect, and choose appropriate units based on your design requirements.
Updated on: 2026-03-15T23:18:59+05:30
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