It contains Default head part which we can include in any layout.It included with header colors .By using gulp you can change header colors also.
{% if color=="default" %}
{% set skin = 'css/skins/default_skin.css' %}
{% elif color=="primary" %}
{% set skin = 'css/skins/primary_skin.css' %}
{% elif color=="success" %}
{% set skin = 'css/skins/success_skin.css' %}
{% elif color=="danger" %}
{% set skin = 'css/skins/danger_skin.css' %}
{% elif color=="mint" %}
{% set skin = 'css/skins/mint_skin.css' %}
{% elif color=="purple" %}
{% set skin = 'css/skins/purple_skin.css' %}
{% else %}
{% set skin = 'css/skins/default_skin.css' %}
{% endif %}
<meta charset="UTF-8">
<meta content='width=device-width, initial-scale=1, maximum-scale=1' name='viewport'>
<link rel="shortcut icon" href="img/logo2.ico"/>
<!--start global css-->
<link type="text/css" rel="stylesheet" href="css/app.css" />
<!-- end of global css -->
<link type="text/css" rel="stylesheet" href="css/custom.css" />
<link type="text/css" rel="stylesheet" href="{{skin}}"/>