Web Reference: Feb 11, 2026 · That one formula fixes the most common border radius mistake in UI design. This guide covers the golden rule for nested corners, Apple's secret squircle formula, how to build a radius scale system, and the psychology behind why rounded corners actually affect user behavior. CSS border-radius Property The border-radius property defines the radius of an element's corners. This property can be applied to all elements with a background-color, a border, or a background-image. Here are three examples: 1. Rounded corners for an element with a background color: Rounded corners! 2. Rounded corners for an element with a border: The padding edge (inner border) radius is the outer border radius minus the corresponding border thickness. In the case where this results in a negative value, the inner radius is zero.
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