<form class="form-horizontal">
      <div class="control-group">
        <label class="control-label" for="inputEmail">Email</label>
        <div class="controls">
          <div class="input-prepend">
            <span class="add-on"><i class="icon-envelope"></i></span>
            <input type="email" id="inputEmail" class="input-block-level" placeholder="Email">
          </div>
        </div>
      </div>
      <div class="control-group">
        <label class="control-label" for="inputPassword">Password</label>
        <div class="controls">
          <input type="password" id="inputPassword" class="input-block-level" placeholder="Password">
        </div>
      </div>
    </form>