Z Index

:root {
  align-items: center;
}

.items {
  flex-direction: row;
  align-items: center;
  margin-top: 20px;
}

.item1 {
  width: 100px;
  height: 100px;
  background-color: coral;
}

.item2 {
  width: 80px;
  height: 80px;
  margin-left: -20px;
  background-color: slategray;
}

.item1, .item2 {
  transition: scale 200ms;
}

.item1:hover, .item2:hover {
  cursor: pointer;
  z-index: 10;
  scale: 1.1;
}