Examine source code of Blue Metal

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue Metal",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-000-5672c42860d5b06e1058dc477397f3ef.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(225, 234, 239)",
      "toolbar_text": "rgb(74, 74, 74)",
      "frame": "rgb(125, 167, 193)",
      "tab_background_text": "rgb(64, 64, 64)",
      "toolbar_field": "rgb(249, 249, 249)",
      "toolbar_field_text": "rgb(74, 74, 74)",
      "tab_line": "rgb(135, 135, 135)",
      "popup": "rgb(242, 246, 248)",
      "popup_text": "rgb(74, 74, 74)",
      "popup_border": "rgb(185, 192, 195)",
      "sidebar_highlight_text": "rgb(255, 255, 255)",
      "sidebar_highlight": "rgb(35, 155, 230)",
      "sidebar_text": "rgb(64, 64, 64)",
      "sidebar": "rgb(242, 246, 248)",
      "tab_selected": "rgb(225, 234, 239)",
      "tab_text": "rgb(59, 59, 59)",
      "toolbar_bottom_separator": "rgb(208, 222, 230)",
      "toolbar_field_border": "rgb(216, 222, 225)",
      "toolbar_top_separator": "rgb(208, 222, 230)",
      "toolbar_vertical_separator": "rgb(191, 210, 221)",
      "tab_loading": "rgb(135, 135, 135)"
    }
  }
}