Examine source code of A gradient

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Man Of Steel",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(40, 1, 7)",
      "toolbar_text": "rgb(250, 167, 169)",
      "frame": "rgb(6, 26, 39)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(80, 5, 8)",
      "toolbar_field_text": "rgb(245, 220, 226)",
      "tab_line": "rgb(245, 206, 214)",
      "popup": "rgb(47, 68, 109)",
      "popup_text": "rgb(223, 250, 250)",
      "tab_loading": "rgb(245, 206, 214)"
    }
  }
}