Examine source code of Galaxy Theme by Nucleos

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Galaxy Theme by Nucleos",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(173, 0, 255, 0.16)",
      "toolbar_text": "rgb(255, 0, 77)",
      "frame": "rgb(173, 0, 255)",
      "tab_background_text": "rgb(255, 159, 53)",
      "toolbar_field": "rgba(255, 135, 8, 0.25)",
      "toolbar_field_text": "rgb(255, 135, 8)",
      "tab_line": "rgb(255, 0, 76)",
      "popup": "rgb(49, 30, 77)",
      "popup_text": "rgb(255, 135, 8)",
      "tab_loading": "rgb(255, 0, 76)"
    }
  }
}