Examine source code of Blue to red

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Blue to red",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center center"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(54, 62, 86)",
      "toolbar_text": "rgb(194, 208, 251)",
      "frame": "rgb(176, 110, 103)",
      "tab_background_text": "rgb(181, 198, 255)",
      "toolbar_field": "rgb(79, 89, 121)",
      "toolbar_field_text": "rgb(194, 208, 251)",
      "tab_line": "rgb(118, 151, 249)",
      "popup": "rgb(112, 124, 154)",
      "popup_text": "rgb(251, 251, 251)",
      "button_background_active": "rgb(194, 208, 251)",
      "button_background_hover": "rgb(226, 234, 253)",
      "icons_attention": "rgb(231, 237, 253)",
      "icons": "rgb(226, 234, 253)",
      "ntp_background": "rgb(226, 234, 253)",
      "ntp_text": "rgb(75, 80, 90)",
      "tab_selected": "rgb(83, 94, 127)",
      "tab_text": "rgb(194, 205, 223)",
      "toolbar_field_highlight": "rgb(194, 208, 251)",
      "toolbar_field_separator": "rgb(194, 208, 251)",
      "tab_loading": "rgb(118, 151, 249)"
    }
  }
}