http://bootstrapk.com/css/

라벨과 콘트롤을 감쌀때 사용.

<form>
  <div class="form-group">
    <label for="exampleInputEmail1">이메일 주소</label>
    <input type="email" class="form-control" id="exampleInputEmail1" placeholder="이메일을 입력하세요">
  </div>
  <div class="form-group">
    <label for="exampleInputPassword1">암호</label>
    <input type="password" class="form-control" id="exampleInputPassword1" placeholder="암호">
  </div>
  <div class="form-group">
    <label for="exampleInputFile">파일 업로드</label>
    <input type="file" id="exampleInputFile">
    <p class="help-block">여기에 블록레벨 도움말 예제</p>
  </div>
</form>