vosidiy

<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
 <a class="navbar-brand" href="#">Brand</a>
 
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#main_nav">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="main_nav">

<ul class="navbar-nav">

vosidiy

<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
  <a class="navbar-brand" href="#">Brand</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#main_nav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="main_nav">

 <ul class="navbar-nav">
	<li class="nav-item active"> <a class="nav-link" href="#">Home </a> </li>

vosidiy

<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#main_nav">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="main_nav">
<ul class="navbar-nav">
	<li class="nav-item active"> <a class="nav-link" href="#">Home </a> </li>
	<li class="nav-item"><a class="nav-link" href="#"> About </a></li>
	<li class="nav-item"><a class="nav-link" href="#"> Services </a></li>

vosidiy

<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
  <a class="navbar-brand" href="#">Navbar</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#main_nav" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="main_nav">
<ul class="navbar-nav">
	<li class="nav-item active"> <a class="nav-link" href="#">Home </a> </li>
	<li class="nav-item"><a class="nav-link" href="#"> About </a></li>
	<li class="nav-item"><a class="nav-link" href="#"> Services </a></li>

vosidiy

<nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
  <a class="navbar-brand" href="#">Brand </a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#main_nav">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="main_nav">
    <ul class="navbar-nav mx-auto">
	<li class="nav-item active"> <a class="nav-link" href="#">Home </a> </li>
	<li class="nav-item"><a class="nav-link" href="#"> About </a></li>
	<li class="nav-item"><a class="nav-link" href="#"> Services </a></li>

vosidiy

<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#main_nav">
    <span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="main_nav">

<ul class="navbar-nav">
<li class="nav-item"> <a class="nav-link" href="#"> First level 1 </a> </li>
<li class="nav-item"> <a class="nav-link" href="#"> First level 2 </a></li>
<li class="nav-item dropdown">

vosidiy

<header>
<div class="bg-warning py-2">
	<div class="container">
		Some top header info
	</div>
</div>
<nav id="navbar_top" class="navbar navbar-expand-lg navbar-dark bg-primary">
<div class="container">
  <a class="navbar-brand" href="#">Navbar</a>

vosidiy

<nav class="navbar fixed-top navbar-expand-lg navbar-dark bg-primary">
  <a class="navbar-brand" href="#">Brand</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#main_nav">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="main_nav">
    <ul class="navbar-nav">
      <li class="nav-item active"> <a class="nav-link" href="#">Home </a> </li>
      <li class="nav-item"><a class="nav-link" href="#"> About </a></li>
      <li class="nav-item"><a class="nav-link" href="#"> Services </a></li>

vosidiy

<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#main_nav">
  <span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="main_nav">
<ul class="navbar-nav">
  <li class="nav-item"> <a class="nav-link" href="#"> Home </a> </li>
  <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" href="#" data-toggle="dropdown"> Mega submenu </a>
	<ul class="dropdown-menu">

vosidiy

<button data-toggle="modal" data-target="#modal_aside_right" class="btn btn-primary" type="button">  Modal aside right  </button>

<div id="modal_aside_right" class="modal fixed-right fade" tabindex="-1" role="dialog">
  <div class="modal-dialog modal-dialog-aside" role="document">
    <div class="modal-content">
      <div class="modal-header">
        <h5 class="modal-title">Right fixed sample</h5>
        <button type="button" class="close" data-dismiss="modal" aria-label="Close">
          <span aria-hidden="true">&times;</span>
        </button>