Examine source code of Red And Black Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Red & Black",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-001-9c6d74e14860e77ee6f8f43e824bff25.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(0, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(85, 85, 85)",
      "tab_background_text": "rgb(189, 189, 189)",
      "toolbar_field": "rgb(55, 55, 55)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 0, 0)",
      "popup": "rgb(66, 66, 66)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_hover": "rgb(74, 74, 74)",
      "icons_attention": "rgb(139, 0, 0)",
      "icons": "rgb(203, 0, 0)",
      "ntp_background": "rgb(30, 29, 29)",
      "tab_background_separator": "rgb(18, 18, 18)",
      "tab_loading": "rgb(255, 0, 0)"
    }
  }
}