Examine source code of Periwinkle blues

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "periwinkle",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(206, 218, 255)",
      "toolbar_text": "rgb(4, 23, 255)",
      "frame": "rgb(134, 161, 228)",
      "tab_background_text": "rgb(251, 251, 255)",
      "toolbar_field": "rgb(238, 242, 255)",
      "toolbar_field_text": "rgb(4, 23, 255)",
      "tab_line": "rgb(134, 161, 228)",
      "popup": "rgb(251, 251, 255)",
      "popup_text": "rgb(81, 91, 235)",
      "button_background_hover": "rgb(183, 197, 252)",
      "popup_highlight": "rgba(104, 131, 246, 0.73)",
      "tab_loading": "rgb(134, 161, 228)"
    }
  }
}