Examine source code of Big City Sunset

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Big City Sunset",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(100, 241, 227, 0.48)",
      "toolbar_text": "rgba(17, 2, 0, 0.84)",
      "frame": "rgb(142, 179, 201)",
      "tab_background_text": "rgb(0, 0, 7)",
      "toolbar_field": "rgba(233, 242, 241, 0.61)",
      "toolbar_field_text": "rgb(2, 41, 32)",
      "tab_line": "rgb(251, 231, 49)",
      "popup": "rgba(202, 249, 238, 0.97)",
      "popup_text": "rgb(0, 35, 41)",
      "tab_loading": "rgb(251, 231, 49)"
    }
  }
}