Theme Background Slot

{
  "type": "string",
  "description": "PowerPoint theme-controlled slide background slot from the active color scheme. These are slots, not assumptions about actual colors: light1 is usually white and dark1 is usually black by convention, but the color scheme controls the real values.",
  "enum": [
    "light1",
    "light2",
    "dark1",
    "dark2"
  ]
}