Examine source code of Just greyyy

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "just grey",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(227, 227, 227)",
      "toolbar_text": "rgb(113, 115, 119)",
      "frame": "rgb(180, 180, 180)",
      "tab_background_text": "rgb(63, 63, 70)",
      "toolbar_field": "rgba(255, 255, 255, 0.8)",
      "toolbar_field_text": "rgb(20, 20, 22)",
      "tab_line": "rgb(119, 137, 240)",
      "popup": "rgb(212, 212, 212)",
      "popup_text": "rgb(50, 50, 50)",
      "tab_loading": "rgb(119, 137, 240)"
    }
  }
}