Examine source code of A soft dusk

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dusk",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(157, 166, 181)",
      "toolbar_text": "rgb(49, 18, 45)",
      "frame": "rgb(74, 70, 79)",
      "tab_background_text": "rgb(221, 227, 231)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(25, 15, 26)",
      "tab_line": "rgb(146, 17, 119)",
      "popup": "rgb(222, 231, 245)",
      "popup_text": "rgb(97, 32, 84)",
      "ntp_background": "rgb(200, 209, 224)",
      "tab_loading": "rgb(146, 17, 119)"
    }
  }
}