Examine source code of Mountains yeah

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Mountains",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(28, 28, 28)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(10, 21, 30)",
      "tab_background_text": "rgb(76, 104, 109)",
      "toolbar_field": "rgb(70, 74, 79)",
      "toolbar_field_text": "rgb(15, 14, 47)",
      "tab_line": "rgb(44, 54, 112)",
      "popup": "rgb(8, 31, 49)",
      "popup_text": "rgb(249, 249, 249)",
      "tab_loading": "rgb(44, 54, 112)"
    }
  }
}