Examine source code of My own dark side

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "My own dark side",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(41, 41, 41)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(41, 41, 41)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(30, 30, 30)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(158, 158, 158)",
      "popup": "rgb(81, 81, 81)",
      "popup_text": "rgb(255, 255, 255)",
      "icons_attention": "rgb(255, 60, 62)",
      "popup_highlight_text": "rgb(255, 255, 255)",
      "tab_selected": "rgb(74, 74, 74)",
      "toolbar_bottom_separator": "rgb(37, 30, 30)",
      "toolbar_field_border_focus": "rgb(83, 83, 83)",
      "toolbar_field_border": "rgb(77, 77, 77)",
      "toolbar_field_highlight": "rgb(109, 109, 109)",
      "tab_loading": "rgb(158, 158, 158)"
    }
  }
}