.address-form form {
  position: relative;
}
.address-form.loader > * {
  opacity: 0.5;
  transition: all 0.3s;
  pointer-events: none;
}
.address-form.loader form:before {
  content: '';
  width: 50px;
  height: 50px;
  display: block;
  position: absolute;
  top: 50%;
  left: 50%;
  margin: -25px 0 0 -25px;
  background: #fff url("../images/ajax-loader.gif") no-repeat center;
  border-radius: 5px;
  z-index: 100;
  box-shadow: 0 0 3px rgba(0,0,0,0.18);
}