<nav class="navbar navbar-expand-md bg-dark navbar-dark">
  <!-- Brand -->
  <a class="navbar-brand" href="/Default.aspx">
    <img id="logo" alt="Logo" src="https://picsum.photos/id/2/50/50">
    <span>Logo Name</span>
  </a>

  <!-- Toggler/collapsible Button -->
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
    <span class="navbar-toggler-icon"></span>
  </button>

  <!-- Navbar links -->
  <div class="collapse navbar-collapse justify-content-end" id="collapsibleNavbar">
    <ul class="navbar-nav">
      <li class="nav-item"> <a class="nav-link" href="#">Home</a> </li>
      <!-- Dropdown -->
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toggle="dropdown">
          About Us
        </a>
        <div class="dropdown-menu dropdown-menu-right">
          <a class="dropdown-item" href="#">Meetings meetings meetings</a>
          <a class="dropdown-item" href="#">Subscriptions</a>
          <a class="dropdown-item" href="#">History</a>
        </div>
      </li>
      <li class="nav-item"> <a class="nav-link" href="#">Contact</a> </li>
    </ul>
  </div>
</nav>
<div class="container">
  <div class="row">
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-12 col-sm-6 col-md-4 col-lg-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">Special title treatment</h5>
          <p class="card-text">
            With supporting text below as a natural lead-in to additional
            content.
          </p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
  </div>
</div>

/* top level*/
.navbar-nav > li > a {
  padding: 10px 0 0 0;
}
/* dropdown item */
.navbar-nav a.dropdown-item {
  padding: 5px 10px;
}
@media screen and (max-width: 767px) {
  .navbar-collapse {
    padding-top: 25px;
  }
}

.card{margin:1rem 0 0;}
Run Pen

External CSS

  1. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css

External JavaScript

  1. https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.min.js
  2. https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.5.2/js/bootstrap.min.js