CSS border-radius Property
Rounds the corners of an element's border box
Syntax
border-radius: <length> | <percentage>;Values
| Value | Description |
|---|---|
| 0 | No rounding (default) |
| <length> | Fixed radius (1-4 values) |
| <percentage> | Percentage-based radius |
| 50% | Creates a circle from a square |
| 9999px | Pill/capsule shape |
Example
.avatar {
border-radius: 50%;
width: 48px;
height: 48px;
}
.button {
border-radius: 8px;
}Understanding CSS border-radius
The CSS border-radius property rounds the corners of an element's border box. As part of the Box Model module in CSS, it is one of the most commonly used properties for controlling the visual presentation of web pages.
You can set border-radius to values such as 0, <length>, <percentage>, 50%, among others. Each value changes how the browser renders the affected element, giving you fine-grained control over your page layout and design. Choosing the right value depends on the specific design requirements of your project.
Common use cases for the border-radius property include responsive web design, component-based layouts, and creating visually consistent interfaces across devices. It works closely with related properties like border, border-top-left-radius, border-top-right-radius to achieve complex styling effects. Understanding how these properties interact helps you write cleaner, more maintainable stylesheets.
Browser support for border-radius is excellent across all modern browsers including Chrome, Firefox, Safari, and Edge. For older browsers, consider using fallback values or progressive enhancement strategies. The property can also be set dynamically via JavaScript using element.style.borderRadius or the CSS custom properties (variables) approach for theming.
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