Examine source code of Dawn Theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Dawn",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(47, 61, 67, 0.57)",
      "toolbar_text": "rgb(236, 218, 206)",
      "frame": "rgb(11, 25, 59)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(9, 9, 9, 0.31)",
      "toolbar_field_text": "rgb(207, 123, 94)",
      "tab_line": "rgb(225, 209, 198)",
      "popup": "rgb(54, 69, 75)",
      "popup_text": "rgb(205, 205, 207)",
      "tab_loading": "rgb(225, 209, 198)"
    }
  }
}