Examine source code of Dark Sheik

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Better Dark Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-033-cf10aca0d9374ba108ef8e68a5f5e931.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(57, 57, 57)",
      "toolbar_text": "rgb(255, 255, 255)",
      "frame": "rgb(29, 29, 29)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgba(0, 0, 0, 0.42)",
      "toolbar_field_text": "rgb(255, 255, 255)",
      "tab_line": "rgba(255, 255, 255, 0.4)",
      "popup": "rgba(40, 40, 40, 0.83)",
      "popup_text": "rgb(255, 255, 255)",
      "ntp_background": "rgb(29, 29, 29)",
      "ntp_text": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(25, 25, 25)",
      "tab_loading": "rgba(255, 255, 255, 0.4)"
    }
  }
}