Prompt pattern
Add one controlled light source to a dark page
A small colour glow can focus attention without turning the background into an effect.
Fills the background part of a prompt.
Place one or two soft colour glows near the edge of the opening section, keeping each behind the content and away from body text. Let the brightest area sit near the main action, with the rest of the page returning to a plain dark surface. Do not animate the glow or use more than two competing colours.
Use this background pattern when it changes the result the agent should produce. It provides one concrete direction without deciding unrelated parts of the website.