Examine source code of Seeing Spots...

{
  "theme": {
    "images": {
      "theme_frame": "SeeingSpots_header_byLisa.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffccff"
    }
  },
  "version": "2.0",
  "name": "Seeing Spots...",
  "manifest_version": 2,
  "description": "background design, pink lime blue spots on a black background\n\nchild friendly persona\n\nPersonas by LisaAtTheBeach"
}