JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/css/bootstrap.min.css">
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.1.1/js/bootstrap.min.js"></script>
<div class="container">
    <div class="row">
      <form name="search" role="search">
        <div class="form-group col-sm-10 col-xs-12">
            <input type="text" class="form-control input-lg" placeholder="Hey"/>
        </div>
        <div class="form-group">
          <button class="btn btn-primary btn-lg col-sm-2 col-xs-12" type="submit">
            Search
          </button>
        </div>
      </form>
      <div class="line"></div>
    </div>
</div>

CSS

.line{
  height: 1px;
  width: 100%;
  margin-top: 68px;
  background-color: #e5e5e5;
}