.hero .hero-media {
  /* Été */
    /*background-image:url(//s3.amazonaws.com/imagescloud/images/ct/pcm/20180430-m.jpg);*/
  /* Automne */
    /*background-image:url(//s3.amazonaws.com/imagescloud/images/ct/pcm/20150901-m.jpg); */
  /* Hiver  */
  background-image:url(//s3.amazonaws.com/imagescloud/images/ct/pcm/20151101-m.jpg);
}

@media only screen and (min-width: 768px) {
  .hero .hero-media {
    /* Été  */
      /*background-image:url(//s3.amazonaws.com/imagescloud/images/ct/pcm/20180430.jpg);*/
    /* Automne */
    /* background-image:url(//s3.amazonaws.com/imagescloud/images/ct/pcm/20150901.jpg); */
    /* Hiver */
   background-image:url(//s3.amazonaws.com/imagescloud/images/ct/pcm/20151101.jpg);
}
}