<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>登录界面</title>
<style>
*{
margin:0px;
padding:0px;
outline:none;
border:none;
}
.box_1{
padding:10px;
}
a{
color:#1481b8;
float:right;
height:25px;
text-decoration:none;
}
span{
margin-left:-10px;
}
form{
width:190px;
font-size:14px;
background:#dedede;
text-align:center;
padding:10px;
}
input{
width:190px;
height:30px;
text-indent:2em;
margin-bottom:10px;
border:0 solid #fff;
border-radius:3px;
}
input[type="checkbox"]{
float:left;
width:15px;
margin-left:5px;
margin-top:-5px;
}
.lgBtm {
width:190px;
height:37px;
background:url(http://img.mukewang.com/539a972b00013e9102280177.jpg);
}
.isBtm{
width:190px;
height:37px;
border:none;
background:url(http://img.mukewang.com/539a972b00013e9102280177.jpg);
background-position:0 -37px;
margin-top:15px;
}
</style>
</head>
<body>
<div class="box_1">
<form>
<input type="text" name="userName" id="userName" placeholder="邮箱/手机号/用户名" ><br />
<input type="text" name="userName" id="userName" placeholder="请输入密码"><br />
<input type="checkbox"><span>下次自动登录</span><a href="#">忘记密码？</a><br/>
<button class="lgBtm"><i></i></button>
<hr>
<button class="isBtm"><i></i></button>
</form>
</div>
</body>
</html>
因为你在初始化设置时*{border：none；}把所有边框都去掉了