.login-bg-b {
  background: url(../images/Login_page_bg_c.jpg);
  background-size: cover;

  background-repeat: no-repeat;
}

.middle-box {
  background: rgba(255, 255, 255, 0.68);
      display: inherit;
      border: solid #e6e6e6 1px;
}

.pos-main-img {
   width: 290px;
  margin: 0 auto;
    display: block;
}


@media only screen and (min-width: 992px) {
  .adjust-top-b {
    margin-top:100px;
  }
  .login-bg-b {
background-position: 0 -280px;
  }

}

@media only screen and (max-width: 991px) {

  .pos-main-img {
    display: none;
  }

  .login-bg-b {
background-position: 0 -106px;
  }
}


@media only screen and (min-width: 1933px) {

  .login-bg-b {
background-position: 0 -311px ;
  }

}