JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<body>

  <br>
  <br>

  <div class="container theme-showcase" role="main">

    <div class="row">
      <div class="col-sm-12 foo">
        <div class="row">
          <div class="col-lg-4 col-sm-6 col-xs-8 center-block pull-none bar">
            <form>
              <div class="form-group">
                <label for="exampleInputEmail1">Email address</label>
                <input type="email" class="form-control" id="exampleInputEmail1" placeholder="Email">
              </div>
              <div class="form-group">
                <label for="exampleInputPassword1">Password</label>
                <input type="password" class="form-control" id="exampleInputPassword1" placeholder="Password">
              </div>
              <div class="form-group">
                <label for="exampleInputFile">File input</label>
                <input type="file" id="exampleInputFile">
                <p class="help-block">Example block-level help text here.</p>
              </div>
              <div class="checkbox">
                <label>
                  <input type="checkbox"> Check me out
                </label>
              </div>
              <button type="submit" class="btn btn-default">Submit</button>
            </form>
          </div>
        </div>
      </div>
    </div>
    
    <br>
    <br>
    
    <div class="row">
      <div class="col-sm-12 foo">
        <div class="row">
          <div class="col-sm-6 col-sm-offset-4 center-block pull-none bar">
            <form>
              <div class="form-group">
                <label for="exampleInputEmail1">Email address</label>
                <input type="email" class="form-control" id="exampleInputEmail1" placeholder="Email">
             ...

CSS

.navbar .navbar-nav>.open>a,
.navbar .navbar-nav>.open>a:focus,
.navbar .navbar-nav>.open>a:hover {
  background-color: red;
}

.foo {
  background: red;
}

.bar {
  background: yellow;
}

.pull-none {
  float: none;
}