html {
  font-size: 1em;
}

body {
  background-color: rgb(255, 255, 255);
}

.telefono {
  z-index: 4;
  position: fixed;
  top: 0;
  width:100%;
  height: 50px;
  background-image:url(../images/telefono.png);
  background-repeat: no-repeat;
  background-position-x: 50%;
}
.image {
  position: absolute;
  height: auto;
  width:100%;
  overflow: hidden;
}

.image-1 {
  z-index: 1;
  width: 100%;
  max-width: 1280px;
  left: 50%;
  margin-left: -640px;
}

.image-2 {
  clear: both;
  z-index: 2;
  width: 100%;
  max-width: 900px;
  display:none;
}

.image-3 {
  z-index: 3;
  width: 100%;
  max-width: 640px;
  display:none;
}

@media(max-width: 900px) {
  .image {
    position: relative;
    height: auto;
  }

  .image-1 {
    z-index: 1;
	display:none;
  }

  .image-2 {
    z-index: 2;
	display:inherit;
  }

  .image-3 {
    clear: both;
    z-index: 3;
	display:none;
  }
}

@media(max-width: 640px) {
  .image {
    position: relative;
    height: auto;
  }

  .image-1 {
    z-index: 1;
	display:none;
  }

  .image-2 {
    z-index: 2;
	display:none;
  }

  .image-3 {
    z-index: 3;
	display:inherit;
  }
  .telefono {
  z-index: 4;
  position: fixed;
  top: 0;
  width:100%;
  height: 50px;
  background-image:url(../images/telefono.png);
  background-repeat: no-repeat;
  background-position-x: 100%;
  background-size:50%
}
}