Examine source code of gray rainy day

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "gray rainy day",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(129, 131, 129, 0.29)",
      "toolbar_text": "rgb(245, 245, 245)",
      "frame": "rgb(106, 114, 105)",
      "tab_background_text": "rgb(7, 250, 46)",
      "toolbar_field": "rgba(21, 21, 20, 0.83)",
      "toolbar_field_text": "rgb(26, 243, 8)",
      "tab_line": "rgb(227, 247, 7)",
      "popup": "rgb(13, 13, 12)",
      "popup_text": "rgb(7, 247, 7)",
      "tab_loading": "rgb(227, 247, 7)"
    }
  }
}