Examine source code of Black and Red Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Black and Red 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(243, 93, 93)",
      "frame": "rgb(25, 25, 25)",
      "tab_background_text": "rgb(202, 81, 81)",
      "toolbar_field": "rgb(31, 31, 31)",
      "toolbar_field_text": "rgb(255, 86, 86)",
      "tab_line": "rgb(187, 15, 15)",
      "popup": "rgb(31, 31, 31)",
      "popup_text": "rgb(255, 86, 86)",
      "tab_loading": "rgb(187, 15, 15)"
    }
  }
}