求一个简单的登录界面CSS代码

<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: absolute;top:250px;left: -159px;width: 260px;height: 47px;background: red;opacity: 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:30px;font-weight: bold;text-align: center;margin-bottom: 30px;}

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