Examine source code of clean dark readable

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "clean dark readable",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(34, 34, 34)",
      "toolbar_text": "rgb(185, 185, 185)",
      "frame": "rgb(36, 36, 36)",
      "tab_background_text": "rgb(169, 169, 169)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(63, 52, 120)",
      "tab_line": "rgb(35, 205, 49)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(71, 71, 71)",
      "ntp_background": "rgb(36, 36, 36)",
      "tab_loading": "rgb(35, 205, 49)"
    }
  }
}