.img_bg {
    height:auto;
    background:url(../img/login-zhuce.jpg) no-repeat center fixed;
    -webkit-background-size:cover;
    -moz-background-size:cover;
    -o-background-size:cover;
    background-size:cover;
}
.zhuce_title{
    line-height:100px;
    color:#fff;
}
.zhuce_container{
    width: 1000px;
    margin: 0 auto;
    background:#fff;
    border-radius:10px;
}
.padding30{
    padding:30px;
}
.form-group strong{
    color:red;
}
.back_login {
    line-height:70px;
}