Example:

<div class="nav-sidebar">
    <button class="nav-sidebar-btn active">Wi-Fi</button>
    <button class="nav-sidebar-btn">Network</button>
    <button class="nav-sidebar-btn">Bluetooth</button>
    <span class="separator"></span>
    <button class="nav-sidebar-btn">Appearance</button>
    <button class="nav-sidebar-btn">Notifications</button>
    <button class="nav-sidebar-btn">Search</button>
    <button class="nav-sidebar-btn">Multitasking</button>
</div>