Examine source code of Beautiful Grid

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Grid",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-005-f5f3cf677b1f132c75ddc7bd319dd1fc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(111, 103, 94, 0.75)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(115, 143, 146)",
      "tab_background_text": "rgb(232, 232, 232)",
      "toolbar_field": "rgb(101, 101, 101)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgb(210, 189, 166)",
      "popup": "rgb(84, 107, 104)",
      "popup_text": "rgb(255, 255, 255)",
      "tab_loading": "rgb(210, 189, 166)"
    }
  }
}