.login-bg{
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: #ffffff;
  z-index: 10000;
}
.login-form{
  width: 320px;
  padding: 30px;
  border: 1px solid #dddddd;
  margin-left: -150px;
  position: absolute;
  left: 50%;
  top: 50px;
}