.love {
  display: inline-block;
  position: relative;
  top: .1em;
  font-size: 1.4em;
  -webkit-transform: scale(.9);
  -moz-transform: scale(.9);
  transform: scale(.9);
  -webkit-animation: love .5s infinite linear alternate-reverse;
  -moz-animation: love .5s infinite linear alternate-reverse;
  animation: love .5s infinite linear alternate-reverse;
  color: red;
}

@-webkit-keyframes love {
  to {
    -webkit-transform: scale(1.5);
  }
}

@-moz-keyframes love {
  to {
    -moz-transform: scale(1.5);
  }
}

@keyframes love {
  to {
    transform: scale(1.5);
  }
}