body {
  position : relative;
}
.rollback > .rollback-inner {
  position: relative;

  /* non-essential theming */
  background-color: #ddd;
}
.rollback > .is-detached,
.rollback > .is-detached.is-hidden,
.rollback > .is-detached.is-visible {
  position: fixed;
  left: 0;
  right: 0;
  transition: top 0.4s ease-in-out;

  /* non-essential theming */
  background-color: #dee;
}
.rollback > .is-visible {
  top: 0;
}