Edit in JSFiddle

<a href="#">Increase font size</a>
body {
  font-family: Calibri;
  font-size: 18px;
}

a {
  display: inline-block;
  padding-left:20px;
  transition: .3s;
  font-weight:bold;
  text-decoration:none;
}
a:hover {
  -webkit-transform: scale(1.2);
  transform: scale(1.2);
}