Fluid Morphing Blob — Pure CSS Animation with Source Code
The Fluid Morphing Blob is a visually stunning, 100% pure CSS animation that creates an organic, liquid-like shape using complex border-radius keyframe animations. No JavaScript, no SVG — just CSS. It’s perfect for abstract hero section backgrounds, loading indicators, and decorative UI elements.
How It Works
CSS border-radius accepts up to 8 values (4 horizontal + 4 vertical radii) that can be independently animated. By cycling them through non-uniform values with @keyframes, the shape morphs fluidly between organic forms. A simultaneous background-size animation on the gradient creates the color-shifting effect.
Use Cases
- Abstract hero section backgrounds
- Decorative loading spinners
- Profile picture frames with premium feel
- Section dividers and decorative blobs
- App icon screens and splash pages
How to Customize
- Change shape speed: Modify
8sinanimation: morph 8s ease-in-out infinite - Change gradient colors: Update the values in
background: linear-gradient(...) - Add a photo inside: Set
overflow: hiddenand add an<img>inside.blob— the morphing border-radius will clip it
Frequently Asked Questions
Why use border-radius instead of SVG for blob morphing?
CSS border-radius morphing is simpler to author, easier to customize by non-developers, and performs better on mobile because the GPU only needs to apply a transform — no SVG path recalculation is required.
Can I animate multiple blobs at different speeds?
Yes! Duplicate the .blob element and give each a different animation-duration and animation-delay in CSS. Use position: absolute to layer them for a complex background effect.
Is this animation accessible?
Yes. Since it’s purely decorative, add aria-hidden="true" to the blob element to hide it from screen readers. Ensure there’s sufficient color contrast if placing text on top of the blob.
