#hero-copia {
  position: relative;
  height: 100vh;
  overflow: hidden;
  z-index: 1;
}

.hero-slider {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  z-index: 0;
  animation: slideBackground 10s infinite ease-in-out;
  background-image: url('../img/img_slider1.jpg'); /* primera imagen */
}

@keyframes slideBackground {
  0%   { background-image: url('img/img_slider2.jpg'); }
  0%  { background-image: url('img/img_slider3.jpg'); }
  0%  { background-image: url('img/img_slider4.jpg'); }
  0%  { background-image: url('/img/img_slider5.jpg'); }
  0% { background-image: url('/img/img_slider6.jpg'); }
}

.container.content {
  position: relative;
  z-index: 2;
}