aside {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
}

aside img:nth-of-type(1) {
  width: 60%;
}

aside img:nth-of-type(2) {
  width: 100%;
}

aside img:nth-of-type(3) {
  width: 80%;
}

@media (max-width: 768px) {
  aside {
    order: 2;
  }
}