non-responsibe-navbar

navbar.html

<nav class='navbar navbar-default navbar-static-top'>
  <div class='container-fluid'>
      <a href='#' class='navbar-brand'>Demo</a>
      <ul class="nav navbar-right pull-right" id='header-buttons'>
        <li class='navbar-btn'>
          <button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown">
            <span class="glyphicon glyphicon-plus" aria-hidden='true'></span>
            <span class="caret"></span>
          </button>
            <ul class="dropdown-menu">
              <li><a href="#">Menu1</a></li>
              <li><a href="#">Menu2</a></li>
              <li><a href="#">Menu3</a></li>
            </ul>
        </li>

        <li class='navbar-btn'> <!-- これがないボタンが上部寄せにになる -->
          <div class="dropdown">
            <button class="btn btn-default dropdown-toggle" type="button" data-toggle="dropdown">
              Menu
              <span class="caret"></span>
            </button>
            <ul class="dropdown-menu">
              <li><a href="#">Menu1</a></li>
              <li><a href="#">Menu2</a></li>
              <li><a href="#">Menu3</a></li>
            </ul>
          </div>
        </li>
      </ul>
  </div>
</nav>

override-bootstrap.css

.navbar {
  min-width: 320px;
}

.navbar-brand {
  margin-left: -15px;
}

#header-buttons {
  margin: 0px;
}

#header-buttons > li {
  margin-left: 10px;
  display: inline-block;
}

.navbar-right .dropdown-menu {
  left: auto;
  right: 0;
}

.navbar-nav .open .dropdown-menu {
  position: absolute;
  float: none;
  width: auto;
  background-color: white;
  box-shadow: rgba(0, 0, 0, 0.172549) 0px 6px 12px 0px;
  margin-top: 2px;
  border: 1px solid rgba(0, 0, 0, 0.15)
}