Examine source code of dgd artificial selection

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      "additional_backgrounds_tiling": [
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    "colors": {
      "toolbar": "rgb(60, 62, 95)",
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      "frame": "rgb(255, 192, 150)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
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      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 0, 0)",
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