Examine source code of theme by abracadabra

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(43, 43, 43)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(0, 0, 0)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(0, 0, 0)",
      "toolbar_field_text": "rgb(215, 189, 190)",
      "tab_line": "rgb(211, 32, 38)",
      "popup": "rgba(0, 0, 0, 0.88)",
      "popup_text": "rgb(255, 255, 255)",
      "button_background_active": "rgb(106, 105, 105)",
      "button_background_hover": "rgb(62, 62, 65)",
      "icons_attention": "rgb(227, 56, 61)",
      "icons": "rgb(246, 240, 240)",
      "ntp_text": "rgb(255, 255, 255)",
      "popup_border": "rgb(0, 0, 0)",
      "tab_loading": "rgb(219, 13, 34)",
      "toolbar_field_border_focus": "rgb(62, 62, 65)",
      "toolbar_field_border": "rgb(20, 17, 17)",
      "toolbar_field_focus": "rgb(0, 0, 0)",
      "toolbar_field_highlight": "rgb(182, 79, 79)",
      "toolbar_field_separator": "rgb(169, 7, 7)",
      "toolbar_field_text_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(0, 0, 0)",
      "toolbar_vertical_separator": "rgb(255, 255, 255)"
    }
  }
}