css代码：
@charset "utf-8";
*{
margin: 0px;
padding: 0px;
font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
font-size: 12px;
}
a{
text-decoration: none;
}
html{
width: 100%;
height: 100%;
overflow-x:hidden;
overflow-y:auto;
}
body{
width: 100%;
min-height: 100%;
}
.login-bg{
background:url(./bg.png) no-repeat center;
background-size: cover;
overflow: hidden;
}html代码：
//你的内容