Examine source code of Pastelly Field

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "My Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-019-7ce748211c61f9059493d4c4378e8a74.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(251, 160, 181, 0.33)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(60, 105, 134)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(209, 3, 52)",
      "popup": "rgb(95, 132, 156)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(209, 3, 52)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{60fae8b7-0af1-4196-b7ef-5ed04c655cc6}"
    }
  }
}