Examine source code of Cool (Dark) theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Cool Dark ",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-030-0f935cfde055600d01a959c5c15353de.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(62, 62, 62)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(37, 37, 37)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(62, 62, 62)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(255, 255, 255)",
      "popup": "rgb(62, 62, 62)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(77, 77, 77)",
      "ntp_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(253, 253, 253)",
      "tab_loading": "rgb(255, 255, 255)"
    }
  }
}