Examine source code of Dark Theme - Purple icons

{
  "manifest_version": 2,
  "version": "1.1",
  "name": "Dark Theme - Purple icons",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-029-cc9cab928c1799136d18758709e91ecc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(54, 58, 62)",
      "toolbar_text": "rgb(142, 179, 201)",
      "frame": "rgb(54, 58, 62)",
      "tab_background_text": "rgb(142, 179, 201)",
      "toolbar_field": "rgb(54, 58, 62)",
      "toolbar_field_text": "rgb(196, 176, 255)",
      "tab_line": "rgb(203, 186, 255)",
      "popup": "rgb(54, 58, 62)",
      "popup_text": "rgb(142, 179, 201)",
      "button_background_active": "rgb(126, 117, 153)",
      "button_background_hover": "rgb(99, 91, 121)",
      "icons_attention": "rgb(206, 176, 255)",
      "icons": "rgb(196, 176, 255)",
      "ntp_background": "rgb(54, 58, 62)",
      "ntp_text": "rgb(142, 179, 201)",
      "popup_border": "rgb(206, 176, 255)",
      "sidebar_border": "rgb(34, 34, 34)",
      "sidebar_highlight_text": "rgb(196, 176, 255)",
      "sidebar_highlight": "rgb(61, 56, 75)",
      "sidebar_text": "rgb(142, 179, 201)",
      "sidebar": "rgb(54, 58, 62)",
      "tab_background_separator": "rgba(255, 0, 4, 0)",
      "tab_selected": "rgb(61, 56, 75)",
      "toolbar_field_border_focus": "rgb(196, 176, 255)",
      "toolbar_field_border": "rgba(196, 176, 255, 0)",
      "toolbar_field_highlight_text": "rgb(203, 186, 248)",
      "toolbar_field_highlight": "rgb(90, 81, 120)",
      "toolbar_field_separator": "rgba(196, 176, 255, 0.13)",
      "tab_loading": "rgb(203, 186, 255)"
    }
  }
}