Examine source code of Zero Symbol small

{
  "theme": {
    "images": {
      "theme_frame": "SemTtulo-2.PNG"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#fffcfc"
    }
  },
  "version": "2.0",
  "name": "Zero Symbol small",
  "manifest_version": 2,
  "description": "Like Zero Symbol, but small, for smalls toolbars like mine"
}