Examine source code of Material Design(grey)

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#d3d3d3",
      "tab_background_text": "#242424"
    }
  },
  "version": "2.0",
  "name": "Material Design(grey)",
  "manifest_version": 2,
  "description": "The second version of the fill in today's popular \"Material Design\".\nIn future, frequent updates, as well as different variations of colors.\n(Look best on 1366x768)"
}