.i-popup {
  position: fixed;
  width: 750px;
}
.top {
  left: 0;
  right: 0;
}
.bottom {
  left: 0;
  right: 0;
}
.left {
  bottom: 0;
  top: 0;
}
.right {
  bottom: 0;
  top: 0;
}