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

    
    <nav role="navigation" class="header-navbar navbar navbar-with-menu navbar-fixed-top navbar-semi-dark navbar-shadow">
        <div class="navbar-wrapper">
            <div class="navbar-header">
                .....
            </div>
            <div class="navbar-container content container-fluid">
                <div id="navbar-mobile" class="collapse navbar-toggleable-sm">
                    .....
                </div>
            </div>
        </div>
    </nav>
    <div id="fullscreen-search" class="fullscreen-search">
        .....
    </div>
    <div class="fullscreen-search-overlay"></div>
                

Generate apex menu using below menu structure.

    
    <div id="main-menu" data-scroll-to-active="true" class="main-menu menu-dark menu-fixed menu-shadow menu-accordion">
        <!-- main menu header-->
        <div class="main-menu-header">
            <input type="text" placeholder="Search" class="menu-search form-control round"/>
        </div>
        <!-- / main menu header-->
        <!-- main menu content-->
        <div class="main-menu-content">
            <ul id="main-menu-navigation" data-menu="menu-navigation" class="navigation navigation-main">
                .....
            </ul>
        </div>
        <!-- /main menu content-->
        <!-- main menu footer-->
        <div class="main-menu-footer footer-close">
            .....
        </div>
        <!-- main menu footer-->
    </div>
                

Content Structure

Generate apex content area using following structure.

    
    <div class="apex-content content container-fluid">
        <div class="content-wrapper">
            <div class="content-header row">
                .....
            </div>
            <div class="content-body">
                .....
            </div>
        </div>
    </div>
                

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

    
    <footer class="footer footer-light">
        .....
    </footer>