Examine source code of BTS - BE dark version

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "BTS - BE dark version",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 255, 255, 0.01)",
      "toolbar_text": "rgb(150, 150, 150)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(128, 128, 128)",
      "toolbar_field": "rgba(255, 255, 255, 0.1)",
      "toolbar_field_text": "rgb(120, 120, 120)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(65, 65, 65)",
      "button_background_hover": "rgb(100, 100, 100)",
      "icons": "rgba(175, 175, 175, 0.45)",
      "ntp_background": "rgb(0, 0, 0)",
      "popup_border": "rgb(255, 255, 255)",
      "popup_highlight": "rgb(255, 255, 255)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_text": "rgb(255, 255, 255)",
      "tab_background_separator": "rgba(255, 255, 255, 0)",
      "tab_selected": "rgba(255, 255, 255, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(255, 255, 255, 0)",
      "toolbar_field_border_focus": "rgb(0, 0, 0)",
      "toolbar_field_border": "rgba(255, 255, 255, 0.5)",
      "toolbar_field_focus": "rgb(75, 75, 75)",
      "toolbar_field_highlight_text": "rgb(255, 255, 255)",
      "toolbar_field_highlight": "rgb(82, 102, 121)",
      "toolbar_field_separator": "rgba(0, 255, 255, 0)",
      "toolbar_field_text_focus": "rgb(220, 220, 220)",
      "toolbar_top_separator": "rgba(255, 255, 255, 0)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  }
}