Examine source code of Transition Colours

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Colourful",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0.6)",
      "toolbar_text": "rgb(238, 238, 238)",
      "frame": "rgb(32, 128, 64)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(0, 0, 0, 0.6)",
      "toolbar_field_text": "rgb(238, 238, 238)",
      "tab_line": "rgb(238, 238, 238)",
      "popup": "rgb(20, 75, 66)",
      "popup_text": "rgb(238, 238, 238)",
      "sidebar_border": "rgba(255, 255, 255, 0)",
      "sidebar_text": "rgb(238, 238, 238)",
      "sidebar": "rgb(16, 64, 32)",
      "tab_background_separator": "rgba(255, 255, 255, 0)",
      "tab_text": "rgb(238, 238, 238)",
      "toolbar_field_border_focus": "rgb(156, 172, 0)",
      "toolbar_field_border": "rgb(156, 172, 0)",
      "toolbar_field_highlight": "rgb(156, 172, 0)",
      "toolbar_field_separator": "rgba(255, 255, 255, 0)",
      "tab_loading": "rgb(238, 238, 238)"
    }
  }
}