Examine source code of Syd_sunset

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Syd_sunset",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(176, 171, 169, 0.7)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(255, 255, 255)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(248, 112, 140)",
      "popup": "rgb(149, 10, 10)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(248, 112, 140)"
    }
  }
}