JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.js"></script>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.css">
<nav class="navbar navbar-inverse" role="navigation">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Brand</a>
    </div>

    <div class="navbar-collapse collapse width" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Link</a></li>
        <li><a href="#">Link</a></li>
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <b class="caret"></b></a>
          <ul class="dropdown-menu">
            <li><a href="#">Action</a></li>
            <li><a href="#">Another action</a></li>
            <li><a href="#">Something else here</a></li>
            <li class="divider"></li>
            <li><a href="#">Separated link</a></li>
            <li class="divider"></li>
            <li><a href="#">One more separated link</a></li>
          </ul>
        </li>
      </ul>
      <form class="navbar-form navbar-left" role="search">
        <div class="form-group">
            <input type="text" class="form-control" placeholder="Search" />
        </div>
      </form>
    </div><!-- /.navbar-collapse -->
  </div><!-- /.container-fluid -->
</nav>

CSS

/*
 * from: component-animations.less
 */
.collapsing.width {
  width: 0;  
  height: auto;
  -webkit-transition: width .35s ease;
  transition: width .35s ease;
}

/*
 * from: navbar.less
 */
.navbar-collapse.width {
  position: fixed;
  height: 100%;
  max-height: initial;
  max-width: 80%;
}
    
.navbar-collapse.width .navbar-nav {
  width: 300px;
}

@media all and (min-width: 768px) {
  .navbar-collapse.width {
    position: static;
    max-width: initial;
  }

  .navbar-collapse.width .navbar-nav {
    width: auto;
  }
}

.navbar-inverse .navbar-collapse.width {
  background-color: #222;
}