Advanced CSS Border Radius Shapes
Create ellipses, leaf shapes, and organic forms using the full CSS border-radius shorthand — 8-value syntax.
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Tags: advanced CSS border radius, CSS blob shape, 8-value border-radius
Advanced CSS Border Radius Shapes The property goes far beyond simple rounded corners. Its 8-value syntax gives each corner an independent horizontal and vertical radius, enabling ellipses, leaf shapes, blob forms, and organic UI components. This guide covers the full syntax and practical shape recipes. --- What is The Full Syntax? The shorthand you already know is a simplified form. The complete syntax is: Values before the slash: horizontal radii for top-left, top-right, bottom-right, bottom-left Values after the slash: vertical radii for the same corners Using percentages: Percentages resolve relative to the element's own width (horizontal) and height (vertical). This makes the shape always proportional: What is Shape Recipes? Ellipse Egg / Teardrop Shape Leaf Shape Organic Blob Half…
Frequently Asked Questions
What is the 8-value border-radius syntax?
The full `border-radius` shorthand accepts 8 values separated by a slash: `border-radius: [horizontal radii] / [vertical radii]`. Each corner has an independent horizontal and vertical radius, letting you create elliptical corners. For example, `border-radius: 40% 60% 60% 40% / 60% 30% 70% 40%` creates an organic blob.
How do I create a leaf shape in CSS?
A leaf uses two large radii on opposite corners: `border-radius: 0 100% 0 100%` creates a diamond-like leaf. Rotate 45 degrees with `transform: rotate(45deg)` for a classic leaf orientation. Adjust the radii percentages to control how pointed or rounded the tips appear.
How do I make an organic blob shape in CSS?
Blobs use asymmetric percentage values in the 8-value syntax. Start with `border-radius: 60% 40% 30% 70% / 60% 30% 70% 40%` and animate by transitioning to a different set of values. Tools like the CSS Border Radius Generator make experimenting with these values quick.
How do I make a speech bubble in CSS?
A speech bubble combines a rounded rectangle with a triangle pointer. Create the main shape with standard `border-radius`, then add the pointer with a `::before` or `::after` pseudo-element using the CSS border triangle technique — zero size, three transparent borders, one colored.
What is corner smoothing?
Corner smoothing (also called superellipse or 'squircle') blends the straight edge into the curve more gradually than standard border-radius. Apple popularized it for iOS icons. In CSS, it's approximated with SVG `clip-path` using a squircle path, or via the CSS `path()` function. True corner smoothing isn't yet a CSS property.
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