Examine source code of new_red_brick

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "new red brick",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(121, 51, 26, 0.44)",
      "toolbar_text": "rgba(242, 242, 240, 0.8)",
      "frame": "rgb(97, 54, 26)",
      "tab_background_text": "rgb(245, 245, 245)",
      "toolbar_field": "rgba(18, 47, 38, 0.24)",
      "toolbar_field_text": "rgba(251, 243, 247, 0.8)",
      "tab_line": "rgba(255, 234, 1, 0.99)",
      "popup": "rgb(136, 53, 44)",
      "popup_text": "rgba(255, 255, 255, 0.8)",
      "ntp_background": "rgba(5, 98, 91, 0.99)",
      "tab_loading": "rgba(255, 234, 1, 0.99)"
    }
  }
}