Examine source code of Modern Grey

{
  "name": "Modern Grey",
  "author": "Jimmy Sophiaan",
  "manifest_version": 2,
  "version": "2021.10.5",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "frame": "rgb(202, 205, 210)",
      "frame_inactive": "rgb(202, 205, 210)",
      "tab_text": "white",
      "tab_background_text": "black",
      "tab_line": "rgb(112, 116, 123)",
      "tab_loading": "rgb(202, 205, 210)",
      "toolbar": "rgb(112, 116, 123)",
      "toolbar_top_separator": "rgb(90, 93, 98)",
      "toolbar_bottom_separator": "rgb(90, 93, 98)",
      "toolbar_field": "rgb(112, 116, 123)",
      "toolbar_field_text": "white",
      "toolbar_field_border": "rgb(90, 93, 98)",
      "toolbar_field_focus": "white",
      "toolbar_field_text_focus": "black",
      "toolbar_field_border_focus": "rgb(90, 93, 98)",
      "toolbar_field_highlight": "rgba(24, 139, 251, 0.5)",
      "toolbar_field_highlight_text": "black",
      "button_background_hover": "rgb(139, 143, 149)",
      "button_background_active": "rgb(90, 93, 98)",
      "bookmark_text": "white",
      "icons": "white",
      "icons_attention": "white",
      "popup": "rgb(112, 116, 123)",
      "popup_text": "white",
      "popup_border": "rgb(112, 116, 123)",
      "popup_highlight": "rgb(24, 139, 251)",
      "popup_highlight_text": "white",
      "sidebar": "rgb(214, 217, 221)",
      "sidebar_text": "black",
      "sidebar_highlight": "rgb(112, 116, 123)",
      "sidebar_highlight_text": "white"
    }
  }
}