ShowBackground 
Sets the background image or color
Parameters 
| Name | Type | Optional | Description | 
|---|---|---|---|
| background | string | Record<string, string> | ❌ | Background | 
Usage 
ts
engine.script({
  start: [
    engine.action.showBackground("#f67288"),
    engine.action.showBackground("<url>"),
    // latest matching is preferred
    engine.action.showBackground({
      all: "<url>",
      "(orientation: portrait)": "<url>",
      "(prefers-color-scheme: dark)": "#363636",
    }),
  ],
});