Creating rectangles, circles, and rounded rectangles is the basic of CSS. Creating more complex CSS shapes such as triangles, hexagons, stars, hearts, etc. is more challenging but still a simple task if we rely on modern features.

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The CSS shape() function enables creation of complex organic shapes like blobs, wavy dividers, and squiggly frames directly in CSS without SVG. The technique relies on chaining smooth curve commands where each shared point between adjacent curves is the midpoint of their control points. Generators are available for wavy dividers, blobs, and fancy frames. Shapes can be animated by interpolating between two shape() values with the same granularity, and scroll-driven animations are supported via animation-timeline: scroll(). The post walks through the mathematical logic behind smooth curve generation and showcases demos including animated wavy layouts, squishy buttons, and CSS loaders.

Making Complex CSS Shapes Using shape()

<p>Old good Bézier curves in CSS. Cool!</p>
