Examine source code of seaside theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "seaside",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(110, 146, 161)",
      "toolbar_text": "rgb(240, 213, 173)",
      "frame": "rgb(172, 195, 217)",
      "tab_background_text": "rgb(47, 50, 58)",
      "toolbar_field": "rgb(188, 205, 211)",
      "toolbar_field_text": "rgb(240, 220, 173)",
      "tab_line": "rgb(14, 39, 60)",
      "popup": "rgb(215, 231, 241)",
      "popup_text": "rgb(48, 63, 109)",
      "tab_loading": "rgb(14, 39, 60)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e12617f0-108b-4c78-af1d-20bcf3b9b46c}"
    }
  }
}