Examine source code of Viola

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Viola",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/bg-035-ec6e2e3635b86a13a7ebee9a1390e7e7.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(20, 0, 61)",
      "toolbar_text": "rgb(255, 165, 0)",
      "frame": "rgb(33, 8, 29)",
      "tab_background_text": "rgb(124, 183, 253)",
      "toolbar_field": "rgb(0, 4, 27)",
      "toolbar_field_text": "rgb(255, 165, 0)",
      "tab_line": "rgb(94, 246, 217)",
      "popup": "rgb(0, 11, 102)",
      "popup_text": "rgb(82, 162, 255)",
      "button_background_active": "rgb(0, 255, 214)",
      "button_background_hover": "rgb(255, 165, 0)",
      "ntp_background": "rgb(1, 34, 72)",
      "ntp_text": "rgb(75, 138, 212)",
      "tab_loading": "rgb(255, 165, 0)",
      "toolbar_bottom_separator": "rgb(0, 255, 214)",
      "toolbar_field_border_focus": "rgb(164, 255, 241)",
      "toolbar_field_highlight_text": "rgb(128, 239, 223)",
      "toolbar_top_separator": "rgb(0, 255, 214)",
      "toolbar_vertical_separator": "rgb(0, 255, 214)"
    }
  }
}