Examine source code of Modern Red & Blue

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Basic Red",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-026-829b05416f823e170310e7c826ad1bec.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(36, 39, 60)",
      "toolbar_text": "rgb(255, 58, 0)",
      "frame": "rgb(8, 11, 33)",
      "tab_background_text": "rgb(103, 163, 230)",
      "toolbar_field": "rgb(54, 58, 89)",
      "toolbar_field_text": "rgb(0, 247, 244)",
      "tab_line": "rgb(253, 7, 31)",
      "popup": "rgb(17, 25, 94)",
      "popup_text": "rgb(4, 255, 236)",
      "button_background_active": "rgb(29, 25, 58)",
      "button_background_hover": "rgb(18, 6, 111)",
      "icons_attention": "rgb(160, 7, 55)",
      "icons": "rgb(99, 0, 246)",
      "ntp_background": "rgb(27, 8, 55)",
      "tab_selected": "rgb(7, 24, 102)",
      "tab_loading": "rgb(253, 7, 31)"
    }
  }
}