General HTML structure is the same throughout the template. Here is the Folder structure.

HTML Folder structure for Apex assets.

---

apex-admin-template/
└── html/
    ├── ltr/
    |   ├── vertical-menu-template/
    |   ├── vertical-menu-dark-template/
    |   ├── vertical-menu-transparent-template/
    |   ├── horizontal-menu-template/
    |   ├── horizontal-menu-dark-template/
    |   ├── horizontal-menu-transparent-template/
    |   └── vertical-collapsed-menu-template/
    └── rtl/

Following are the details of all html folders.

General HTML structure is the same throughout the template. Here is the header structure.

<nav class="navbar navbar-expand-lg navbar-light header-navbar">
    <div class="container-fluid navbar-wrapper">
        <div class="navbar-header">
            ...
        </div>
        <div class="navbar-container">
            ...
        </div>
    </div>
</nav>

Generate Apex menu using below menu structure.

<div class="wrapper">
    <div class="app-sidebar menu-fixed" data-background-color="man-of-steel" data-image="../app-assets/img/sidebar-bg/01.jpg" data-scroll-to-active="true">
        <!-- main menu header starts -->
        <div class="sidebar-header">
            <div class="logo clearfix">
                ...
            </div>
        </div>
        <!-- main menu header ends -->
        <!-- main menu content starts -->
        <div class="sidebar-content main-menu-content">
            <div class="nav-container">
                <ul class="navigation navigation-main" id="main-menu-navigation" data-menu="menu-navigation">
                    ...
                </ul>
            </div>
        </div>
        <!-- main menu content ends -->
    </div>
</div>

Generate Apex content area using following structure.

<div class="wrapper">
    <div class="main-panel">
        <div class="main-content">
            <div class="content-overlay"></div>
            <div class="content-wrapper">
                ...
            </div>
        </div>
    </div>
</div>

Last but not least, footer structure to complete Apex structure.

<div class="wrapper">
    <div class="main-panel">
        <footer class="footer">
            ...
        </footer>
    </div>
</div>