Examine source code of Rock Theme

{
  "manifest_version": 2,
  "version": "2.0",
  "name": "Rock Theme",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/flash.svg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "frame": [
        51,
        51,
        51
      ],
      "button_background_active": [
        204,
        204,
        204
      ],
      "button_background_hover": [
        187,
        187,
        187
      ],
      "icons": [
        255,
        255,
        255
      ],
      "icons_attention": [
        255,
        255,
        0
      ],
      "ntp_background": [
        51,
        51,
        51
      ],
      "ntp_text": [
        255,
        255,
        255
      ],
      "popup": [
        41,
        41,
        41
      ],
      "popup_border": [
        51,
        51,
        51
      ],
      "popup_highlight": [
        255,
        255,
        0
      ],
      "popup_highlight_text": [
        41,
        41,
        41
      ],
      "popup_text": [
        239,
        239,
        239
      ],
      "sidebar": [
        41,
        41,
        41
      ],
      "sidebar_border": [
        51,
        51,
        51
      ],
      "sidebar_highlight": [
        255,
        255,
        0
      ],
      "sidebar_highlight_text": [
        41,
        41,
        41
      ],
      "sidebar_text": [
        239,
        239,
        239
      ],
      "tab_background_separator": [
        51,
        51,
        51
      ],
      "tab_line": [
        255,
        255,
        0
      ],
      "tab_loading": [
        255,
        255,
        0
      ],
      "tab_background_text": [
        255,
        255,
        255
      ],
      "toolbar": [
        51,
        51,
        51
      ],
      "toolbar_bottom_separator": [
        41,
        41,
        41
      ],
      "toolbar_field": [
        41,
        41,
        41
      ],
      "toolbar_field_border": [
        46,
        46,
        46
      ],
      "toolbar_field_border_focus": [
        255,
        255,
        0
      ],
      "toolbar_field_focus": [
        46,
        46,
        46
      ],
      "toolbar_field_highlight": [
        255,
        255,
        0
      ],
      "toolbar_field_highlight_text": [
        41,
        41,
        41
      ],
      "toolbar_field_separator": [
        239,
        239,
        239
      ],
      "toolbar_field_text": [
        255,
        255,
        255
      ],
      "toolbar_field_text_focus": [
        255,
        250,
        255
      ],
      "bookmark_text": [
        255,
        255,
        255
      ],
      "toolbar_top_separator": [
        41,
        41,
        41
      ],
      "toolbar_vertical_separator": [
        239,
        239,
        239
      ]
    }
  }
}