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.grow { transition: all .2s ease-in-out; }
.grow:hover { transform: scale(1.1); }

OR

.grow{
  -moz-transition:-moz-transform 0.5s ease-in; 
  -webkit-transition:-webkit-transform 0.5s ease-in; 
  -o-transition:-o-transform 0.5s ease-in;
}
.grow:hover{
  -moz-transform:scale(2); 
  -webkit-transform:scale(2);
  -o-transform:scale(2);
}