Examine source code of RealWorld

{
  "theme": {
    "images": {
      "theme_frame": "realworld_persona-header.jpg"
    },
    "colors": {
      "frame": "#d1cfcf",
      "tab_background_text": "#d1cfcf"
    }
  },
  "version": "2.0",
  "name": "RealWorld",
  "manifest_version": 2,
  "description": "Ridiculously simple design based on Real World Records' colourbar logo."
}