Examine source code of MIni red_black

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "MIni red_black",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-023-f741aad3989b46322a7840a425068429.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(87, 96, 87, 0)",
      "toolbar_text": "rgb(242, 52, 55)",
      "frame": "rgb(27, 27, 27)",
      "tab_background_text": "rgb(242, 52, 55)",
      "toolbar_field": "rgba(64, 64, 64, 0)",
      "toolbar_field_text": "rgb(242, 52, 55)",
      "tab_line": "rgba(248, 112, 140, 0)",
      "popup": "rgb(27, 27, 27)",
      "popup_text": "rgb(242, 52, 55)",
      "button_background_active": "rgba(67, 59, 59, 0)",
      "popup_border": "rgba(66, 231, 173, 0)",
      "popup_highlight_text": "rgba(78, 78, 78, 0)",
      "sidebar_border": "rgba(78, 78, 78, 0)",
      "sidebar": "rgb(78, 78, 78)",
      "tab_background_separator": "rgba(192, 192, 192, 0)",
      "tab_selected": "rgba(56, 24, 26, 0.31)",
      "tab_text": "rgb(242, 52, 55)",
      "toolbar_bottom_separator": "rgba(0, 0, 0, 0)",
      "toolbar_field_border": "rgba(0, 0, 0, 0)",
      "toolbar_field_separator": "rgba(70, 90, 83, 0)",
      "toolbar_field_text_focus": "rgba(0, 0, 0, 0)",
      "toolbar_top_separator": "rgba(0, 0, 0, 0)",
      "toolbar_vertical_separator": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgba(248, 112, 140, 0)"
    }
  }
}