simple bootstrap layout code example

Example 1: about section bootstrap 4

<!-- Top menu -->
<nav class="navbar navbar-dark fixed-top navbar-expand-md navbar-no-bg">
    <div class="container">
        <a class="navbar-brand" href="index.html">Bootstrap 4 One Page Website Tutorial</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarNav">
            <ul class="navbar-nav ml-auto">
                <li class="nav-item">
                    <a class="nav-link scroll-link" href="#top-content">Top</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link scroll-link" href="#services">Services</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link scroll-link" href="#about-us">About</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link scroll-link" href="#portfolio">Work</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link scroll-link" href="#testimonials">Clients</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link scroll-link" href="#blog">Blog</a>
                </li>
            </ul>
        </div>
    </div>
</nav>

Example 2: bootstrap basic template

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
    <title>Bootstrap 101 Template</title>

    <!-- Bootstrap -->
    <link href="css/bootstrap.min.css" rel="stylesheet">

    <!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
    <!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
    <!--[if lt IE 9]>
      <script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"></script>
      <script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
    <![endif]-->
  </head>
  <body>
    <h1>Hello, world!</h1>

    <!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <!-- Include all compiled plugins (below), or include individual files as needed -->
    <script src="js/bootstrap.min.js"></script>
  </body>
</html>