Examine source code of rainbow sunset

{
  "manifest_version": 2,
  "version": "1.0",
  "name": " rainbow sunset",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(102, 131, 169, 0.18)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(200, 0, 255)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(80, 35, 120)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(234, 255, 0)",
      "popup": "rgb(17, 70, 70)",
      "popup_text": "rgb(255, 255, 255)",
      "icons": "rgb(255, 255, 255)",
      "ntp_text": "rgb(252, 250, 249)",
      "tab_loading": "rgb(234, 255, 0)"
    }
  }
}