Edit in JSFiddle

<div class="container">
  <img src="https://images.unsplash.com/photo-1432059964050-d4eba2ef368a?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&s=c1dbc3d58047ce558b7820745a072b26">
  <div class="two">
    <h1>I <span> &hearts; </span> code</h1>
  </div>
</div>

.container {
  width: 100%;
  height: 100%;
  .two {
    width: 90%;
    height: 90%;
    top:5%;
    left:5%;
    position: absolute;
    border: 2px solid #dcdcdc;
    display: flex;
    align-items: center;
	  justify-content: center;
    h1 {
    color: #fff;
    font-size: 4em;
    position: relative;
    span {
    color: #e00079;
    display:inline-block;
    }
   }
 }
}

img {
  position: fixed;
  width: 100%;
  top:0;
  left:0; 
}
//Animation
.scaledIt {
  -webkit-animation: scaleUp 1s infinite;
  -moz-animation: scaleUp 1s infinite;
  -o-animation: scaleUp 1s infinite;
  animation: scaleUp 1s infinite;
}
@-webkit-keyframes scaleUp {
  0% {
    transform:scale(1);
  }
  50% {
    transform:scale(1.3);
  }
  100% {
    transform:scale(1);
  }
}
@-moz-keyframes scaleUp {
  0% {
    transform:scale(1);
  }
  50% {
    transform:scale(1.3);
  }
  100% {
    transform:scale(1);
  }
}
@-o-keyframes scaleUp {
  0% {
    transform:scale(1);
  }
  50% {
    transform:scale(1.3);
  }
  100% {
    transform:scale(1);
  }
}
@keyframes scaleUp {
  0% {
    transform:scale(1);
  }
  50% {
    transform:scale(1.3);
  }
  100% {
    transform:scale(1);
  }
}

$('span').addClass('scaledIt');