Examine source code of T1.5

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "T1.5",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(204, 235, 255, 0.97)",
      "toolbar_text": "rgb(214, 81, 109)",
      "frame": "rgb(22, 149, 234)",
      "tab_background_text": "rgb(248, 248, 248)",
      "toolbar_field": "rgb(249, 255, 245)",
      "toolbar_field_text": "rgb(214, 81, 109)",
      "tab_line": "rgba(28, 223, 248, 0.93)",
      "popup": "rgba(225, 237, 249, 0.72)",
      "popup_text": "rgb(4, 63, 124)",
      "button_background_active": "rgba(255, 243, 38, 0.93)",
      "popup_border": "rgb(35, 161, 245)",
      "popup_highlight": "rgb(167, 161, 205)",
      "sidebar_border": "rgba(28, 223, 248, 0.93)",
      "tab_loading": "rgba(28, 223, 248, 0.93)"
    }
  }
}