.hero .hero-media {
  /* Chasse */
  /* background-image:url(//s3.amazonaws.com/imagescloud/images/rf/mas/20150825-m.jpg);*/
  /* Pêche */
    background-image:url(//s3.amazonaws.com/imagescloud/images/rf/mas/20180430-m.jpg);
}

@media only screen and (min-width: 768px) {
  .hero .hero-media {
    /* Chasse */
   /*background-image:url(//s3.amazonaws.com/imagescloud/images/rf/mas/20150825.jpg); */
    /* Pêche */
     background-image:url(//s3.amazonaws.com/imagescloud/images/rf/mas/20180430.jpg);
}
}