<div>
  CSS<br/>
  IS<br/>
  AWESOME
</div>

div {
  border: 1vmin solid blue;
  box-sizing: border-box;
  color: blue;
  font-family: Arial, sans-serif;
  font-size: 15vmin;
  min-height: 51vmin;
  line-height: 15vmin;
  padding: 2vmin;
  width: 51vmin;
}