<form class="form" action="#">
  <div class="input-group">
    <label for="email">Enter your email</label>
    <input type="email" name="email" placeholder="Email" />
    <div class="input-feedback error">Invalid email address!</div>
  </div>

  <div class="input-group">
    <label for="password">Enter your password</label>
    <input type="password" name="email" placeholder="Password" />
    <div class="input-feedback error">incorrect password</div>
  </div>
</form>