Examine source code of cool grey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Black is cool",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-008-60d2718f8c915b5ba09f31df5555b459.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(116, 112, 119, 0.86)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(235, 241, 242)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgba(255, 255, 255, 0.21)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgba(156, 152, 158, 0.68)",
      "popup_text": "rgb(14, 14, 14)",
      "ntp_background": "rgb(184, 181, 185)",
      "popup_border": "rgb(245, 241, 245)",
      "sidebar_border": "rgb(244, 242, 245)",
      "sidebar_text": "rgb(49, 48, 49)",
      "sidebar": "rgb(116, 112, 119)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  }
}