Think of illuminated silk rippling in water: color bands bend and flow across the screen. Use it to add organic motion to an otherwise fixed color field.
`colorA` is the deep background color and `colorB` the primary accent. Increase `distortion` to bend the bands more organically (default 0.5, range 0–2). More `speed` makes the flow faster (default 1, range 0–10), while changing `seed` gives you another variation (default 0, range 0–100).
This layer fills the canvas without an input beneath it. Moving bands can make text and image edges harder to follow, so keep speed and distortion low behind text and leave a clear area for reading. Check the contrast of anything layered over a strong color field.
When to use
Use it for a moving hero background, liquid-like color bands, or subtle motion on a static cover. Avoid it behind long text or fine detail.