Examine source code of 00-ITSD_ADMIN

{
  "name": "00-ITSD_ADMIN",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "modern-icon-design-logo-element-best-identity-logotypes-modern-arrow-icon-design-logo-element-best-identity-127422541.jpg"
    },
    "colors": {
      "frame": "rgba(84, 84, 84, 1)",
      "tab_background_text": "rgba(152, 0, 7, 1)",
      "toolbar": "rgba(71, 71, 71, 1)",
      "bookmark_text": "rgba(186, 0, 0, 1)",
      "toolbar_field": "rgba(199, 199, 199, 1)",
      "toolbar_field_text": "rgba(199, 199, 199, 1)"
    }
  }
}