body {
  display: flex;
  align-items: center;
  justify-content: center;

  height: 100vh;
  margin: 0;
  overflow: hidden;

  font-family: sans-serif;
}

.square {
  position: relative;

  width: 200px;
  height: 200px;
  margin: 0 auto;

  color: #fff;
  font-size: 1.5em;
  text-align: center;

  background: #03a9f4;
  
  transition: 1s;
}

.square:hover {
  transform: scale(1.5);
  
  cursor: pointer;
}