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How to create CSS3 Rounded Corners?
The CSS3 border-radius property allows you to create rounded corners on any element. This property transforms sharp rectangular corners into smooth, curved edges, giving your web designs a more modern and polished appearance.
Syntax
selector {
border-radius: value;
}
Possible Values
| Value | Description |
|---|---|
length |
Set corner radius in px, em, rem, etc. Default is 0. |
% |
Set corner radius as percentage of element's dimensions |
Example 1: Basic Rounded Corners
Here's how to create a container with rounded corners compared to a normal container −
<!DOCTYPE html>
<html>
<head>
<style>
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
padding: 20px;
}
.container {
display: inline-block;
width: 200px;
height: 100px;
text-align: center;
font-size: 18px;
padding: 20px;
margin: 10px;
border: 3px solid #4CAF50;
background-color: #f9f9f9;
}
.rounded {
border-radius: 24px;
}
.normal {
border-radius: 0px;
}
</style>
</head>
<body>
<h1>CSS3 Rounded Corner Example</h1>
<div class="container rounded">Rounded Corners</div>
<div class="container normal">Default Corners</div>
</body>
</html>
Two boxes appear side by side: one with smooth rounded corners (24px radius) and another with sharp default corners. Both have green borders and light gray backgrounds.
Example 2: Rounded Corners for Images
The border-radius property can also be applied to images to create rounded image containers −
<!DOCTYPE html>
<html>
<head>
<style>
.image-container {
width: 150px;
height: 150px;
background: linear-gradient(45deg, #ff6b6b, #4ecdc4);
border-radius: 30px;
margin: 20px;
display: flex;
align-items: center;
justify-content: center;
color: white;
font-weight: bold;
}
.circular {
border-radius: 50%;
}
</style>
</head>
<body>
<h1>Rounded Image Containers</h1>
<div class="image-container">Rounded</div>
<div class="image-container circular">Circular</div>
</body>
</html>
Two gradient boxes appear: one with rounded corners (30px radius) and another that's perfectly circular (50% radius). Both display centered white text.
Key Points
- Use a single value for uniform rounding on all corners
- Use
border-radius: 50%to create perfect circles - Different values can be applied to individual corners using shorthand
- Works with borders, backgrounds, and images
Conclusion
The border-radius property is essential for modern web design, allowing you to create smooth, rounded corners easily. Use pixel values for consistent sizing or percentages for responsive, proportional rounding.
Updated on: 2026-03-15T15:07:08+05:30
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