Examine source code of GridColours

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "GridColours",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(227, 234, 231)",
      "toolbar_text": "rgb(51, 79, 80)",
      "frame": "rgb(153, 225, 217)",
      "tab_background_text": "rgb(51, 79, 80)",
      "toolbar_field": "rgb(218, 225, 222)",
      "toolbar_field_text": "rgb(51, 79, 80)",
      "tab_line": "rgb(19, 199, 206)",
      "popup": "rgb(227, 234, 231)",
      "popup_text": "rgb(51, 79, 80)",
      "tab_loading": "rgb(19, 199, 206)"
    }
  }
}