Examine source code of Shiny

{
  "name": "Shiny",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "essai1.jpg"
    },
    "colors": {
      "toolbar_field": "rgba(124, 179, 230, 1)",
      "toolbar_field_text": "rgba(24, 51, 69, 1)",
      "frame": "rgba(129, 158, 222, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)"
    }
  }
}