作着玩：登录页（纯css，不支持ie9以下）

支持chrome FireFox 和 IE10+，（IE9也能显示，IE9以下不支持）

<style type="text/css">
body{position:relative;}
#login{position:relative;width:500px;margin:0 auto;box-shadow:2px 0px 10px rgba(0,0,0,0.5);border-radius:16px;}
.login-bg{position:absolute;width:1000px;height:190px;left:-250px;right:-250px;top:70px;background:#76ceff;z-index:-1;}

.login-head{box-sizing:border-box;width:100%;height:35px;border:1px solid #0f80c2;border-top-left-radius:16px;border-top-right-radius:16px;z-index:1;}
.login-head-in{box-sizing:border-box;width:100%;height:33px;border:1px solid #5bcefd;border-top-left-radius:16px;border-top-right-radius:16px;
    background:#1ab4f2;
    background:linear-gradient(0deg,#1ab4f2 0,#0592e2 45%,#14a3ef 50%,#02b4fe 100%);
    }
.login-body{box-sizing:border-box;width:100%;height:260px;border-bottom-left-radius:16px;border-bottom-right-radius:16px;
    padding:50px;text-align:center;font-size:16px;z-index:1;
    background:#ecf9ff;
    background:radial-gradient( #fff 25%, #c6eaf8 100%);
    }
.login-body label{font-family: "微软雅黑";font-size:16px;margin-right:0.5em;}
.input32{height:32px;box-sizing:border-box;font-family: "微软雅黑";font-size:16px;line-height:20px;padding:5px 10px;border:1px solid #d0d0d0;}
.button32{height:32px;box-sizing:border-box;font-family: "微软雅黑";font-size:16px;line-height:20px;padding:5px 10px;border:1px solid #5fcffd;
    border-radius:5px;color:#FFF;text-shadow:2px 0px 4px #0c7dc1;text-shadow: 0px 0px 3px #094568;cursor:pointer;
    background:#1ab4f2;
    background:linear-gradient(0deg,#1ab4f2 0,#0592e2 45%,#14a3ef 50%,#02b4fe 100%);
    }
.button32-box{display:inline-block;border:1px solid #0c7dc1;border-radius:5px;}
</style>
</head>
<body>

<h2>支持chrome FireFox 和 IE10+，（IE9也能显示，IE9以下不支持）</h2>
<div id="login">
    <div class="login-bg"></div>
    <div class="login-head">
        <div class="login-head-in"></div>
    </div>
    <div class="login-body">
        <p><label>用户</label><input type="text" name="" class="input32"></p>
        <p><label>密码</label><input type="text" name="" class="input32"></p>
        <div class="button32-box"><input type="submit" name="" value="登录" class="button32"></div>
    </div>
</div>