body{overflow-x:hidden;}
.bg{position: absolute;width: 100%;left: 0;top: 0;bottom: 0;right: 0;z-index: 1;}
.logkuang{position: absolute;width: 960px;height: 367px;left: 50%;top: 50px;margin-left: -480px;z-index: 1;}
.layui-form-label{width: 100px;}
@media screen and (max-width: 660px) { 
    .logkuang{
        width: 80%;
        height: 340px;
        margin-left: -40%;
        margin-top: -170px;
    }
}