.parent-repeater {
  /* This creates the masonry layout */
  display: flex;
  margin-top: 35px;
}

@media screen and (min-width: 677px) {
  .parent-repeater {
    margin: 35px 12px 25px 12px;
  }
}

/* Add this media query */
@media screen and (max-width: 676px) {
  .parent-repeater {
    flex-direction: column;
    margin: 35px 12px 0px 12px;
  }
}