body > header > style > background

{
  "$jason": {
    "head": {
      "title": "Background",
      "description": "Shows how to set background color of body"
    },
    "body": {
      "header": {
        "title": "Background color"
      },
      "style": {
        "background": "#d3d3d3"
      }
    }
  }
}

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