Examine source code of Seamless Dark

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Seamless Dark",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-021-775b159da029a74f5c76e835cd65e9dc.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(50, 57, 57)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(50, 57, 57)",
      "tab_background_text": "rgb(208, 212, 212)",
      "toolbar_field": "rgb(48, 57, 55)",
      "toolbar_field_text": "rgba(255, 255, 255, 0.95)",
      "tab_line": "rgba(0, 255, 218, 0)",
      "popup": "rgb(50, 57, 57)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(50, 57, 57)",
      "sidebar_border": "rgba(6, 241, 162, 0)",
      "sidebar_text": "rgb(255, 255, 255)",
      "sidebar": "rgb(50, 57, 57)",
      "tab_loading": "rgb(0, 255, 213)",
      "tab_selected": "rgb(50, 57, 57)",
      "toolbar_bottom_separator": "rgba(0, 255, 221, 0)",
      "toolbar_field_border": "rgba(255, 255, 255, 0)",
      "toolbar_top_separator": "rgba(0, 255, 218, 0)",
      "toolbar_vertical_separator": "rgba(0, 255, 221, 0)"
    }
  }
}