The setup for the admin is the page layout, lets examine.
Layout
This is the framework for the page. It sets up the menu bar and the main content. I just added a container on the main content so it wont go wider than a bootstrap container.
<div class= "page" >
<div class= "page-sidebar" >
... sidebar
</div>
<div class= "page-body" >
<div class= "page-main-bg container" >
... content
</div>
</div>
</div>
Sidebar
An example for a sidebar, it has a couple of examples, a media object i juse for my user image. A default sidebar link and an open and closed sidebar menu.
<div class= "sidebar navbar navbar-expand-lg navbar-dark d-lg-block px-0" >
<div class= "text-lg-center py-3 px-3" >
<a class= "site-title" href= "#" >
... site title
</a>
</div>
<button class= "navbar-toggler mr-3" type= "button" data-toggle= "collapse" data-target= "#main-menu" aria-controls= "navbarText" aria-expanded= "false" aria-label= "Toggle navigation" >
<span class= "navbar-toggler-icon" ></span>
</button>
<div class= "collapse navbar-collapse" id= "main-menu" >
<div class= "col-12 px-0" >
<a class= "sidebar-user" href= "#profile" >
<div class= "media" >
... media object
</div>
</a>
<ul id= "menu" class= "sidebar-menu" >
<li class= "active" >
<a class= "sidebar-link" href= "#" > ... sidebar link</a>
</li>
<li class= "sidebar-sub" >
<a class= "sidebar-link collapsed" href= "#sub-menu-1" data-toggle= "collapse" > ... toggable submenu</a>
<ul class= "sidebar-sub collapse" id= "sub-menu-1" >
<li class= "active" >
<a class= "sidebar-link" href= "#" > ... sidebar link</a>
</li>
</ul>
</li>
<li class= "sidebar-sub active" >
<a class= "sidebar-link" href= "#sub-menu-1" data-toggle= "collapse" > ... active toggable submenu</a>
<ul class= "sidebar-sub collapse in" id= "sub-menu-1" >
<li class= "active" >
<a class= "sidebar-link" href= "#" > ... sidebar link</a>
</li>
... and so on
</ul>
</li>
</ul>
</div>
</div>
</div>