Examine source code of Keep It Simple

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Lotus Media",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(244, 255, 254)",
      "toolbar_text": "rgb(99, 99, 99)",
      "frame": "rgb(178, 225, 224)",
      "tab_background_text": "rgb(54, 54, 54)",
      "toolbar_field": "rgb(215, 221, 219)",
      "toolbar_field_text": "rgb(81, 81, 81)",
      "tab_line": "rgb(252, 15, 0)",
      "popup": "rgb(244, 244, 244)",
      "popup_text": "rgb(75, 75, 75)",
      "tab_loading": "rgb(252, 15, 0)"
    }
  }
}