.hero .hero-media {
  /* Été*/
  /* background-image:url(//s3.amazonaws.com/imagescloud/images/ct/20150104-m.jpg);*/
  /*Automne*/
   /*background-image:url(//s3.amazonaws.com/imagescloud/images/ct/20210908-m.jpg);*/
  /*Hiver */
   background-image:url(//s3.amazonaws.com/imagescloud/images/ct/20141205-m.jpg);
}

@media only screen and (min-width: 768px) {
  .hero .hero-media {
    /* Été*/
   /*background-image:url(//s3.amazonaws.com/imagescloud/images/ct/20150104.jpg);*/
    /*Automne */
   /*background-image:url(//s3.amazonaws.com/imagescloud/images/ct/20210908.jpg); */
    /*Hiver */
    background-image:url(//s3.amazonaws.com/imagescloud/images/ct/20141205.jpg);
}
}