Examine source code of Green Leaf backround

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Leaf",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(29, 30, 31, 0.7)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(53, 97, 144)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(0, 0, 0, 0.37)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgba(29, 30, 31, 0.82)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(242, 242, 242)",
      "sidebar_border": "rgba(0, 0, 0, 0)",
      "sidebar_text": "rgb(0, 0, 0)",
      "sidebar": "rgb(242, 242, 242)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  }
}