Examine source code of Dark Sur

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Big Sur Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(33, 33, 33, 0.44)",
      "toolbar_text": "rgba(255, 255, 255, 0.66)",
      "frame": "rgb(33, 33, 33)",
      "tab_background_text": "rgb(33, 33, 33)",
      "toolbar_field": "rgb(33, 33, 33)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.66)",
      "tab_line": "rgba(253, 217, 119, 0)",
      "popup": "rgb(33, 33, 33)",
      "popup_text": "rgb(255, 255, 255)",
      "icons_attention": "rgb(137, 84, 184)",
      "icons": "rgba(255, 255, 255, 0.66)",
      "ntp_background": "rgb(33, 33, 33)",
      "ntp_text": "rgb(255, 255, 255)",
      "sidebar_border": "rgba(253, 217, 119, 0)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(33, 33, 33)",
      "tab_background_separator": "rgba(253, 217, 119, 0)",
      "tab_loading": "rgb(137, 84, 184)",
      "tab_selected": "rgba(253, 217, 119, 0)",
      "tab_text": "rgb(255, 255, 255)",
      "toolbar_bottom_separator": "rgba(33, 33, 33, 0.44)",
      "toolbar_field_border_focus": "rgba(253, 217, 119, 0)",
      "toolbar_field_border": "rgba(253, 217, 119, 0)",
      "toolbar_field_focus": "rgb(33, 33, 33)",
      "toolbar_field_highlight_text": "rgb(33, 33, 33)",
      "toolbar_field_highlight": "rgb(149, 82, 84)",
      "toolbar_field_separator": "rgba(253, 217, 119, 0)",
      "toolbar_field_text_focus": "rgba(255, 255, 255, 0.66)",
      "toolbar_top_separator": "rgba(253, 217, 119, 0)",
      "toolbar_vertical_separator": "rgba(33, 33, 33, 0.44)"
    }
  }
}