Examine source code of cirno's theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "cirno's theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(134, 134, 134, 0.34)",
      "toolbar_text": "rgb(0, 105, 141)",
      "frame": "rgb(113, 211, 255)",
      "tab_background_text": "rgb(211, 246, 255)",
      "toolbar_field": "rgba(192, 234, 255, 0.73)",
      "toolbar_field_text": "rgb(0, 132, 176)",
      "tab_line": "rgb(0, 160, 214)",
      "popup": "rgb(180, 225, 254)",
      "popup_text": "rgb(0, 108, 184)",
      "tab_loading": "rgb(0, 160, 214)"
    }
  }
}