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CSS ToolsUpdated 2024-07-09

Rounding the Edges: The Border Radius Guide

Master CSS curves and elliptical shapes. Learn how to use border-radius for modern UI design, from simple buttons to complex "squiggles."

Introduction

The "sharpness" of a user interface can significantly influence how a user perceives an application. Rounded corners convey friendliness, safety, and a modern aesthetic, while sharp corners often feel more professional, precise, or technical. Our Border Radius Generator empowers you to find the perfect balance, providing an intuitive interface for crafting everything from soft buttons to complex, organic shapes.

Step-by-Step Guide

1

Configure Your Corners

Use the individual sliders to adjust the radius of each corner (top-left, top-right, bottom-right, and bottom-left) to create symmetrical or asymmetrical designs.

2

Master Elliptical Curves

Unlock "Fancy" mode to control the horizontal and vertical radii independently. This allows you to create organic, blob-like shapes that are popular in modern web design.

3

Copy the CSS Shorthand

Instantly generate the `border-radius` CSS property. Our tool provides the optimized shorthand notation, ready to be pasted directly into your stylesheet or utility class.

Pro Tips & Best Practices

Pro Tip

The 50% Rule: A border-radius of 50% on a square element will create a perfect circle. On a rectangle, it will create an ellipse.

Pro Tip

Nested Corners: When nesting rounded elements, ensure the outer corner has a slightly larger radius than the inner corner to maintain a consistent visual "gap."

Pro Tip

Accessibility: Avoid extremely large radii on small buttons containing text, as it can occasionally result in text clipping or reduced readability.

Common Mistakes to Avoid

Common Mistake to AvoidOver-rounding: Use consistent radii across your entire application. Mixing 4px, 12px, and 24px corners without a clear system can lead to a messy, unprofessional look.
Common Mistake to AvoidIgnoring the Box Shadow: Rounded corners often look better with a subtle shadow. Ensure your `box-shadow` follows the curve of the element for a premium feel.
Common Mistake to AvoidPercentages vs Fixed Units: Percentage-based radii change as the element scales, while pixel-based radii stay constant. Use pixels for fixed-size elements like buttons.

Frequently Asked Questions

What is the "fancy" border-radius?

CSS allows you to specify eight values for border-radius (four for horizontal, four for vertical), separated by a slash (e.g., `10% / 50%`). This creates elliptical corners.

Will this work in old browsers?

Yes. The `border-radius` property is supported in all modern browsers and has been standard since Internet Explorer 9.

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