Prompt pattern
Use one dark surface that lets the content lead
A single deep backdrop makes bright type, images, and actions easy to pick out.
Fills the background part of a prompt.
Set the page on one near-black or deep navy surface, then use off-white text and one bright action colour. Keep body text at least 4.5 to 1 against the background and reserve lighter panels for content that needs separation. Do not mix several dark shades just to make the page look busy.
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.