body{
  background: #444
}
#placeholder {
  display: flex;
  flex-direction: column;
  flex-wrap: nowrap;
  height: 100vw;
  transform: scale(0.5)
}
img {
  align-self: center;
  border: 10px solid #fff;
  padding: 0px;
  margin: 30px;
  border-radius: 30px;
  box-shadow: 0px 20px 20px black;
  transition: 0.5s all ease-in-out;
}

img:hover {
  transform: scale(2);
  transition: 0.5s all ease-in-out;
}