CODE EXAMPLE FOR CSS

bootstrap 5 sidebar class

<div class="container-fluid">
    <div class="row">
        <div class="col-sm-auto bg-light sticky-top">
            <div class="d-flex flex-sm-column flex-row flex-nowrap bg-light align-items-center sticky-top">
                <a href="/" class="d-block p-3 link-dark text-decoration-none" title="" data-bs-toggle="tooltip" data-bs-placement="right" data-bs-original-title="Icon-only">
                    <i class="bi-bootstrap fs-1"></i>
                </a>
                <ul class="nav nav-pills nav-flush flex-sm-column flex-row flex-nowrap mb-auto mx-auto text-center align-items-center">
                    <li class="nav-item">
                        <a href="#" class="nav-link py-3 px-2" title="" data-bs-toggle="tooltip" data-bs-placement="right" data-bs-original-title="Home">
                            <i class="bi-house fs-1"></i>
                        </a>
                    </li>
                    <li>
                        <a href="#" class="nav-link py-3 px-2" title="" data-bs-toggle="tooltip" data-bs-placement="right" data-bs-original-title="Dashboard">
                            <i class="bi-speedometer2 fs-1"></i>
                        </a>
                    </li>
                    <li>
                        <a href="#" class="nav-link py-3 px-2" title="" data-bs-toggle="tooltip" data-bs-placement="right" data-bs-original-title="Orders">
                            <i class="bi-table fs-1"></i>
                        </a>
                    </li>
                    <li>
                        <a href="#" class="nav-link py-3 px-2" title="" data-bs-toggle="tooltip" data-bs-placement="right" data-bs-original-title="Products">
                            <i class="bi-heart fs-1"></i>
                        </a>
                    </li>
                    <li>
                        <a href="#" class="nav-link py-3 px-2" title="" data-bs-toggle="tooltip" data-bs-placement="right" data-bs-original-title="Customers">
                            <i class="bi-people fs-1"></i>
                        </a>
                    </li>
                </ul>
                <div class="dropdown">
                    <a href="#" class="d-flex align-items-center justify-content-center p-3 link-dark text-decoration-none dropdown-toggle" id="dropdownUser3" data-bs-toggle="dropdown" aria-expanded="false">
                        <i class="bi-person-circle h2"></i>
                    </a>
                    <ul class="dropdown-menu text-small shadow" aria-labelledby="dropdownUser3">
                        <li><a class="dropdown-item" href="#">New project...</a></li>
                        <li><a class="dropdown-item" href="#">Settings</a></li>
                        <li><a class="dropdown-item" href="#">Profile</a></li>
                    </ul>
                </div>
            </div>
        </div>
        <div class="col-sm p-3 min-vh-100">
            <!-- content -->
        </div>
    </div>
</div>