Examine source code of Dark Grey Scale

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dark Grey Scale",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(37, 36, 36)",
      "toolbar_text": "rgba(91, 74, 69, 0.84)",
      "frame": "rgb(37, 37, 37)",
      "tab_background_text": "rgb(97, 66, 66)",
      "toolbar_field": "rgba(18, 18, 18, 0.93)",
      "toolbar_field_text": "rgb(135, 78, 78)",
      "tab_line": "rgba(134, 90, 90, 0.5)",
      "popup": "rgb(33, 33, 33)",
      "popup_text": "rgb(97, 97, 97)",
      "button_background_active": "rgba(128, 73, 73, 0.52)",
      "button_background_hover": "rgb(28, 28, 28)",
      "icons_attention": "rgba(248, 89, 75, 0.12)",
      "icons": "rgba(149, 109, 109, 0.32)",
      "popup_border": "rgba(0, 0, 0, 0)",
      "popup_highlight": "rgb(153, 153, 153)",
      "sidebar_border": "rgba(203, 92, 94, 0.27)",
      "sidebar_highlight_text": "rgb(223, 116, 116)",
      "sidebar_highlight": "rgb(53, 53, 53)",
      "sidebar_text": "rgba(215, 96, 89, 0.52)",
      "sidebar": "rgb(36, 36, 36)",
      "tab_background_separator": "rgb(55, 55, 55)",
      "tab_selected": "rgba(247, 89, 79, 0.25)",
      "tab_text": "rgba(0, 0, 0, 0.75)",
      "toolbar_bottom_separator": "rgba(208, 140, 142, 0.05)",
      "toolbar_field_border_focus": "rgba(64, 64, 64, 0.19)",
      "toolbar_field_border": "rgb(0, 0, 0)",
      "toolbar_field_focus": "rgba(21, 19, 19, 0.98)",
      "toolbar_field_highlight_text": "rgb(168, 82, 76)",
      "toolbar_field_highlight": "rgba(74, 74, 74, 0.32)",
      "toolbar_field_separator": "rgb(36, 36, 36)",
      "toolbar_field_text_focus": "rgba(255, 118, 118, 0.3)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)",
      "toolbar_vertical_separator": "rgba(72, 44, 44, 0.58)",
      "tab_loading": "rgba(134, 90, 90, 0.5)"
    }
  }
}