@keyframes grow-and-shrink {
    0% {
      transform: scale(1);
    }
    50% {
      transform: scale(1.1);
    }
    100% {
      transform: scale(1);
    }
  }
  @keyframes grow-and-shrink-rev {
    0% {
      transform: scale(1);
    }
    50% {
      transform: scale(1.2);
    }
    100% {
      transform: scale(1);
    }
  }

  .box {
    animation: grow-and-shrink 10000ms;
    animation-iteration-count: infinite;
    animation-timing-function: ease-in-out;
  }
  .box2 {
    animation: grow-and-shrink-rev 10000ms;
    animation-iteration-count: infinite;
    animation-timing-function: ease-in-out;
  }
  .under {
	position:absolute;
	z-index: 1;
  }
  .over {
	position:absolute;
	z-index:2;
  }
  body {
        background-color: red;
	background-image: url('../images/fondo_am.png');
        /*background-image: url('/imagenes/fondo_am.png');*/
	background-repeat: no-repeat;
	background-position: center;
	background-size: cover;
  }
  html {
      height:100%;
  }