bootstrap 5 navbar

1<section id="headnev" class="navbar navbar-fixed-top">  

1<!-- Bootstrap 5 Navbar -->
2<nav class="navbar navbar-expand-lg navbar-light bg-light">
3   <div class="container-fluid">
4      <a class="navbar-brand" href="#">Navbar</a>
5      <button
6         class="navbar-toggler"
7         type="button"
8         data-bs-toggle="collapse"
9         data-bs-target="#navbarSupportedContent"
10         aria-controls="navbarSupportedContent"
11         aria-expanded="false"
12         aria-label="Toggle navigation"
13      >
14         <span class="navbar-toggler-icon"></span>
15      </button>
16      <div class="collapse navbar-collapse" id="navbarSupportedContent">
17         <ul class="navbar-nav me-auto mb-2 mb-lg-0">
18            <li class="nav-item">
19               <a class="nav-link active" aria-current="page" href="#">Home</a>
20            </li>
21            <li class="nav-item">
22               <a class="nav-link" href="#">Link</a>
23            </li>
24            <li class="nav-item dropdown">
25               <a
26                  class="nav-link dropdown-toggle"
27                  href="#"
28                  id="navbarDropdown"
29                  role="button"
30                  data-bs-toggle="dropdown"
31                  aria-expanded="false"
32               >
33                  Dropdown
34               </a>
35               <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
36                  <li><a class="dropdown-item" href="#">Action</a></li>
37                  <li><a class="dropdown-item" href="#">Another action</a></li>
38                  <li><hr class="dropdown-divider" /></li>
39                  <li>
40                     <a class="dropdown-item" href="#">Something else here</a>
41                  </li>
42               </ul>
43            </li>
44            <li class="nav-item">
45               <a
46                  class="nav-link disabled"
47                  href="#"
48                  tabindex="-1"
49                  aria-disabled="true"
50                  >Disabled</a
51               >
52            </li>
53         </ul>
54         <form class="d-flex">
55            <input
56               class="form-control me-2"
57               type="search"
58               placeholder="Search"
59               aria-label="Search"
60            />
61            <button class="btn btn-outline-success" type="submit">
62               Search
63            </button>
64         </form>
65      </div>
66   </div>
67</nav>

1<nav class="navbar navbar-expand-lg navbar-light bg-light">
2  <a class="navbar-brand" href="#">Navbar</a>
3  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
4    <span class="navbar-toggler-icon"></span>
5  </button>
6
7  <div class="collapse navbar-collapse" id="navbarSupportedContent">
8    <ul class="navbar-nav mr-auto">
9      <li class="nav-item active">
10        <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
11      </li>
12      <li class="nav-item">
13        <a class="nav-link" href="#">Link</a>
14      </li>
15      <li class="nav-item dropdown">
16        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
17          Dropdown
18        </a>
19        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
20          <a class="dropdown-item" href="#">Action</a>
21          <a class="dropdown-item" href="#">Another action</a>
22          <div class="dropdown-divider"></div>
23          <a class="dropdown-item" href="#">Something else here</a>
24        </div>
25      </li>
26      <li class="nav-item">
27        <a class="nav-link disabled" href="#">Disabled</a>
28      </li>
29    </ul>
30    <form class="form-inline my-2 my-lg-0">
31      <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
32      <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
33    </form>
34  </div>
35</nav>

1<nav class="navbar navbar-expand-lg navbar-light bg-light">
2  <div class="container-fluid">
3    <a class="navbar-brand" href="#">Navbar</a>
4    <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
5      <span class="navbar-toggler-icon"></span>
6    </button>
7    <div class="collapse navbar-collapse" id="navbarSupportedContent">
8      <ul class="navbar-nav me-auto mb-2 mb-lg-0">
9        <li class="nav-item">
10          <a class="nav-link active" aria-current="page" href="#">Home</a>
11        </li>
12        <li class="nav-item">
13          <a class="nav-link" href="#">Link</a>
14        </li>
15        <li class="nav-item dropdown">
16          <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-expanded="false">
17            Dropdown
18          </a>
19          <ul class="dropdown-menu" aria-labelledby="navbarDropdown">
20            <li><a class="dropdown-item" href="#">Action</a></li>
21            <li><a class="dropdown-item" href="#">Another action</a></li>
22            <li><hr class="dropdown-divider"></li>
23            <li><a class="dropdown-item" href="#">Something else here</a></li>
24          </ul>
25        </li>
26        <li class="nav-item">
27          <a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
28        </li>
29      </ul>
30      <form class="d-flex">
31        <input class="form-control me-2" type="search" placeholder="Search" aria-label="Search">
32        <button class="btn btn-outline-success" type="submit">Search</button>
33      </form>
34    </div>
35  </div>
36</nav>

1navbar expansível Bootstrap 

1<nav class="navbar navbar-light bg-light">
2  <form class="form-inline">
3    <button class="btn btn-outline-success" type="button">Main button</button>
4    <button class="btn btn-sm btn-outline-secondary" type="button">Smaller button</button>
5  </form>
6</nav>