Bootstrap 3 Collapse problem issue

by galvakojis

HTML

<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
<button class="btn btn-default" type="button" data-toggle="collapse" data-target="#refine-search" aria-expanded="false" aria-controls="refine-search">
  Refine Search
  <span class="caret"></span>
</button>

<div class="collapse refine-search-collapse-container" id="refine-search">
  <form class="form-horizontal well">
    <div class="form-group">
      <div class="col-sm-6">
        <select class="form-control">
          <option value="">ad</option>
          <option value="">sfsd</option>
          <option value="">sdf</option>
          <option value="">sf</option>
          <option value="">sdf</option>
        </select>
      </div>
    </div>
    <div class="form-group">
      <div class="col-sm-6">
        <select class="form-control">
          <option value="">Blah1</option>
          <option value="">Blah2</option>
          <option value="">Blah3</option>
          <option value="">Blah4</option>
          <option value="">Blah5</option>
        </select>
      </div>
    </div>
    <div class="form-group">
      <div class="col-sm-6">
        <input type="number" class="form-control">
      </div>
    </div>
    <div class="form-group">
      <div class="col-sm-6">
        <select class="form-control">
          <option value="">Yes</option>
          <option value="">No</option>
        </select>
      </div>
    </div>
  </form>
</div>

<div class="">
  <h3>Search Result</h3>
</div>

CSS

.well{
  /* margin-bottom:0px; */
}