Examine source code of longhorn m7

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "m7",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(197, 211, 216, 0.13)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(112, 131, 139)",
      "tab_background_text": "rgb(183, 180, 180)",
      "toolbar_field": "rgba(255, 255, 255, 0.3)",
      "toolbar_field_text": "rgb(236, 239, 236)",
      "tab_line": "rgb(74, 232, 30)",
      "popup": "rgb(9, 9, 9)",
      "popup_text": "rgb(245, 245, 245)",
      "tab_loading": "rgb(74, 232, 30)"
    }
  }
}