<div id="container">
<form action="welcome.html">
<div class="login">登陆 窗口</div>
<div class="username-text">用户名（条件提示）:</div>
<div class="password-text">
<p>密 码：（6位以上数字和字母组合）</p>
</p>
</div>
<div class="username-field">
<input type="text" name="username" placeholder="输入用户名" pattern="^[a-zA-z][a-zA-Z0-9_]{2,9}$" />
</div>
<div class="password-field">
<input type="password" name="password" placeholder="密码是什么" pattern="^[a-zA-Z]\w{5,17}$" />
</div>
<input type="checkbox" name="remember-me" id="remember-me" /><label for="remember-me">记住我！</label>
<div class="forgot-usr-pwd">Forgot <a href="#">username</a> or <a href="#">password</a>?</div>
<input type="submit" name="submit" value="登陆" />
</form>
</div>
