Examine source code of Space Journey

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Space Journey ",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(43, 22, 56, 0.36)",
      "toolbar_text": "rgba(67, 32, 91, 0.75)",
      "frame": "rgb(48, 19, 56)",
      "tab_background_text": "rgb(79, 50, 102)",
      "toolbar_field": "rgba(49, 17, 66, 0.29)",
      "toolbar_field_text": "rgba(242, 181, 255, 0.61)",
      "tab_line": "rgba(73, 39, 89, 0.57)",
      "popup": "rgba(43, 15, 49, 0.51)",
      "popup_text": "rgb(30, 12, 40)",
      "button_background_hover": "rgba(58, 37, 70, 0.7)",
      "icons_attention": "rgba(152, 96, 172, 0.58)",
      "icons": "rgba(112, 68, 128, 0.65)",
      "tab_background_separator": "rgba(169, 115, 185, 0.48)",
      "tab_loading": "rgba(194, 137, 210, 0.44)",
      "tab_selected": "rgba(115, 56, 121, 0.39)",
      "tab_text": "rgba(157, 93, 158, 0.59)",
      "toolbar_bottom_separator": "rgba(240, 168, 248, 0.61)",
      "toolbar_field_border_focus": "rgba(213, 172, 249, 0.72)",
      "toolbar_field_border": "rgba(232, 193, 244, 0.34)",
      "toolbar_field_focus": "rgba(195, 138, 247, 0.61)",
      "toolbar_field_highlight_text": "rgba(60, 30, 79, 0.61)",
      "toolbar_field_highlight": "rgba(208, 167, 215, 0.48)",
      "toolbar_field_separator": "rgba(68, 31, 81, 0.36)",
      "toolbar_field_text_focus": "rgba(146, 107, 180, 0.61)",
      "toolbar_top_separator": "rgba(77, 37, 90, 0.57)",
      "toolbar_vertical_separator": "rgba(104, 45, 112, 0.61)"
    }
  }
}