Examine source code of DB railbus

{
  "name": "DB railbus",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "Lucht Ikea 3 Railbussen midden 1964x92.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(5, 247, 13, 1)",
      "toolbar": "rgba(152, 153, 240, 0.2)",
      "bookmark_text": "rgba(247, 255, 10, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.25)",
      "toolbar_field_text": "rgba(34, 30, 92, 1)",
      "tab_line": "rgba(255, 251, 3, 1)"
    }
  }
}