Examine source code of Night: Highlights

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Night: Highlights",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(69, 69, 101, 0.69)",
      "toolbar_text": "rgb(223, 202, 232)",
      "frame": "rgb(27, 8, 74)",
      "tab_background_text": "rgb(58, 34, 122)",
      "toolbar_field": "rgba(59, 47, 55, 0.54)",
      "toolbar_field_text": "rgb(232, 202, 225)",
      "tab_line": "rgb(220, 29, 212)",
      "popup": "rgb(59, 57, 80)",
      "popup_text": "rgb(216, 176, 229)",
      "tab_loading": "rgb(220, 29, 212)"
    }
  }
}