Examine source code of DHL2

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "DHL2",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(251, 208, 4)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(4, 0, 0)",
      "tab_background_text": "rgb(5, 1, 0)",
      "toolbar_field": "rgb(238, 234, 234)",
      "toolbar_field_text": "rgb(8, 0, 0)",
      "tab_line": "rgb(0, 0, 0)",
      "popup": "rgb(181, 174, 174)",
      "popup_text": "rgb(8, 8, 0)",
      "button_background_active": "rgb(255, 255, 255)",
      "tab_text": "rgb(7, 1, 27)",
      "tab_loading": "rgb(0, 0, 0)"
    }
  }
}