Bootstrap 3 + Validation Plugin

HTML

<link rel="stylesheet" href="http://getbootstrap.com/dist/css/bootstrap.css">
<form>
    <div class="form-group">
        <label class="control-label" for="username">Email:</label>
        <div class="input-group">
            <input class="form-control" placeholder="Email" name="email" type="email" required />
        </div>
    </div>
        
    <div class="form-group">
        <label class="control-label" for="password">Password:</label>
        <div class="input-group">
            <input class="form-control" type="password" placeholder="Password" name="lastname" type="text" required />
        </div>
    </div>
    
        <button type="submit" class="btn btn-primary">Submit</button>
</form>

CSS

body {
    padding: 20px;
}