CSS3 and jQuery制作的登录表单

引用css文件
  <link rel="stylesheet" href="css/login-form.css" media="screen">
引用js文件
<script src="jquery.min.js"></script>
    <script src="js/login-form.js"></script>
HTML
<div class="login-form">
        <h1>
            Login Form</h1>
        <form action="#">
        <input type="text" name="username" placeholder="username">
        <input type="password" name="password" placeholder="password">
        <span>
            <input type="checkbox" name="checkbox">
            <label for="checkbox">
                remember</label>
        </span>
        <input type="submit" value="log in">
        </form>
    </div>