Examine source code of Material blue-grey

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#eceff1",
      "tab_background_text": "#212121"
    }
  },
  "version": "2.0",
  "name": "Material blue-grey",
  "manifest_version": 2,
  "description": "Theme based on material design with blue-grey color palette"
}