Examine source code of Blue Scenery

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Blue Grey",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-002-609370e89a219e0548ac5ef6b4a7dd2e.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(15, 58, 78)",
      "toolbar_field": "rgb(245, 251, 254)",
      "toolbar_field_text": "rgb(15, 58, 78)",
      "tab_line": "rgb(202, 109, 23)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(82, 126, 168)",
      "tab_loading": "rgb(202, 109, 23)",
      "bookmark_text": "rgb(223, 238, 252)",
      "frame": "rgb(177, 192, 206)",
      "tab_background_text": "rgb(9, 57, 95)"
    }
  }
}