表单代码：
<form name="form" method="POST" action="">
<input type="text" value="用户名" />
<input type="password" value="密码" />
<input type="submit" name="button" value="登录" class="xiaoka_tj"/>
</form>
你这个登录界面，如果用table做的话很简单，只需要4行3列，然后就是左右对齐设置下如果用css+div也很简单，从上到下4个div，然后在一行的div里面在套div或者直接用ul li来写
<div id="zuo"><!--<input type="button" value="往左" class="y">-->
<h1>登 陆</h1>
<form method="post" action="ok.html">
<p class="form_zh"><input type="text" placeholder="请输入账号" class="form_zh_y" autofocus = "autofocus" required = "required"></p>
<p class="form_mm"><input type="password" placeholder="请输入密码" class="form_zh_e" required = "required"></p>
<input type="submit" value="登 录" class="form_dl">
</form>
<p class="qtfsdl"><span><img src="images/weixin.jpg" />微信登陆</span><span><img src="images/QQ.jpg" />QQ登陆</span></p>
<p class="qtfsdr"><img src="images/frm_xia.jpg"/></p>
<p class="y">注 册</p>
<!--<div class="y1" style="position: absolutetop:250pxleft: -159pxwidth: 260pxheight: 47pxbackground: redopacity: 0.5"></div>-->
</div>
#zuo{
width: 500px
height: 540px
background: white
position: absolute
top: calc(50% - 250px)
left:calc(50% - 250px)
color: #292929
}
#zuo h1,#you h1{margin-top:30pxfont-weight: boldtext-align: centermargin-bottom: 30px}
