These snippets are very helpful in setting up a simple UI fast:
Navbar
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<div class="container-fluid">
<a class="navbar-brand" href="#">Navbar</a>
</div>
</nav>
Login Page
<div class="card center-screen">
<div class="card-header">
Title
</div>
<div class="card-body">
<form>
<div class="form-floating mb-3">
<input type='text' class="form-control" id='username' placeholder='username' />
<label for='username'>Username</label>
</div>
<div class="form-floating mb-3">
<input type='password' class="form-control" id='password' placeholder='password' />
<label for='password'>Password</label>
</div>
<div class="d-flex flex-row justify-content-center">
<button class="btn btn-success btn-block">Login</button>
</div>
<div class="alert alert-danger">Could not login</div>
</form>
</div>
</div>
Sidebar
<div class="d-flex flex-column flex-shrink-0 p-3 bg-light mt-1" style="width: 280px; min-height: 600px;"
<a href="/" class="d-flex align-items-center mb-3 mb-md-0 me-md-auto link-dark text-decoration-none">
<span class="fs-4">Menu</span>
</a>
<hr/>
<ul class="nav nav-pills flex-column mb-auto">
<li class="nav-item">
<a href="/dashboard/users" class='nav-link active' aria-current="page">
Users
</a>
</li>
<li>
<a href="/dashboard/customers" class='nav-link link-dark' aria-current="page">
Customers
</a>
</li>
</ul>
</div>
Bootstrap 5 inline form
<form class="row g-3">
<div class="col-2 align-self-center">
<label class="form-label">Id</label>
</div>
<div class="col-4">
<input type="text" class="form-control" placeholder="123123">
</div>
<div class="col-2 align-self-center">
<label class="form-label">Company</label>
</div>
<div class="col-4">
<input type="text" class="form-control" placeholder="My company">
</div>
<div class="col-2 align-self-center">
<label class="form-label">Name</label>
</div>
<div class="col-4">
<input type="text" class="form-control" placeholder="My Name">
</div>
</form>
Bootstrap 5 flex layout of a search bar with filters
<div class="card">
<div class="card-body d-flex flex-row flex-wrap gap-3">
<label class="col-form-label" for='invoiceId'>Invoice Id</label>
<div>
<input type='search' class="form-control" id='invoiceId'/>
</div>
<label class="col-form-label" for='fromDate'>From Date</label>
<div>
<input type='date' class="form-control" id='fromDate'/>
</div>
<label class="col-form-label" for='toDate'>To Date</label>
<div>
<input type='date' class="form-control" id='toDate'/>
</div>
<div class="col-form-label">Read State</div>
<div>
<select class="form-select" id="readState" defaultValue="all">
<option value="all">All</option>
<option value="read">Read</option>
<option value="unread">Unread</option>
</select>
</div>
<div>
<button class="btn btn-success">Search</button>
</div>
</div>
</div>