Examine source code of pixelnewa

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "newa",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(16, 23, 23)",
      "toolbar_text": "rgb(143, 143, 143)",
      "frame": "rgb(28, 35, 35)",
      "tab_background_text": "rgb(140, 140, 140)",
      "toolbar_field": "rgb(45, 44, 47)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(159, 72, 136)",
      "popup": "rgb(27, 40, 45)",
      "popup_text": "rgb(168, 179, 232)",
      "tab_loading": "rgb(159, 72, 136)"
    }
  }
}