Examine source code of darktheme - green

{
  "manifest_version": 2,
  "version": "1.3",
  "name": "darktheme-green",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(100, 100, 100, 0.4)",
      "toolbar_text": "rgb(220, 220, 220)",
      "frame": "rgb(20, 20, 20)",
      "tab_background_text": "rgb(160, 160, 160)",
      "toolbar_field": "rgb(30, 30, 30)",
      "toolbar_field_text": "rgb(220, 220, 220)",
      "tab_line": "rgb(98, 186, 70)",
      "popup": "rgb(30, 30, 30)",
      "popup_text": "rgb(160, 160, 160)",
      "icons_attention": "rgb(98, 186, 70)",
      "icons": "rgb(220, 220, 220)",
      "ntp_background": "rgb(55, 55, 55)",
      "ntp_text": "rgb(220, 220, 220)",
      "popup_highlight_text": "rgb(98, 186, 70)",
      "tab_loading": "rgb(98, 186, 70)",
      "toolbar_field_separator": "rgb(98, 186, 70)"
    }
  }
}