Examine source code of relacss

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "relacss",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-034-6d9669d30498557e7b5a2db5ecb286d0.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(35, 0, 0)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(10, 35, 52)",
      "tab_background_text": "rgb(152, 152, 184)",
      "toolbar_field": "rgb(16, 16, 24)",
      "toolbar_field_text": "rgb(163, 163, 188)",
      "tab_line": "rgb(23, 23, 90)",
      "popup": "rgb(0, 0, 0)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(23, 23, 90)"
    }
  }
}