Examine source code of Trello-ish Light

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Trello-ish Light",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(88, 132, 158)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(4, 65, 101)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(123, 127, 204)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(4, 65, 101)",
      "sidebar_highlight_text": "rgb(5, 104, 164)",
      "sidebar_text": "rgb(4, 65, 101)",
      "tab_loading": "rgb(0, 160, 255)",
      "toolbar_bottom_separator": "rgb(4, 65, 101)",
      "toolbar_field_border_focus": "rgb(157, 151, 151)",
      "toolbar_field_highlight": "rgb(124, 131, 255)",
      "toolbar_field_text_focus": "rgb(4, 65, 101)",
      "toolbar_top_separator": "rgb(4, 65, 101)",
      "toolbar_vertical_separator": "rgb(255, 255, 255)"
    }
  }
}