Examine source code of cardisplay

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "cardisplay",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(16, 16, 201, 0)",
      "toolbar_text": "rgb(233, 233, 243)",
      "frame": "rgb(12, 11, 11)",
      "tab_background_text": "rgb(235, 235, 245)",
      "toolbar_field": "rgba(245, 245, 250, 0.39)",
      "toolbar_field_text": "rgb(231, 231, 241)",
      "tab_line": "rgb(255, 0, 0)",
      "popup": "rgb(12, 11, 11)",
      "popup_text": "rgb(255, 0, 0)",
      "tab_loading": "rgb(255, 0, 0)"
    }
  }
}