div.marker-delete-wrapper {
  position: relative;
}

.wall-item:hover .marker-delete-button {
  display: block;
}

.marker-delete-button {
  display: none;
  opacity: 0.25;
  position: absolute;
  top: 5px;
  right: 5px;
  z-index: 999;
}

.marker-delete-button:hover {
  opacity: 0.75;
}