<picture class="block">
                    <source srcset="img/musician-360w-min.jpg" media="(max-width: 480px) and (orientation: landscape)">
                    <source srcset="img/musician-285w-min.jpg" media="(max-width: 320px) and (orientation: portrait)">
                    <source srcset="img/musician-285w-min.jpg" media="(min-width: 480px) and (max-width: 600px) and (orientation: 		landscape)">
                    <source srcset="img/musician-360w-min.jpg" media="(min-width: 600px) and (max-width: 992px)">
                    <source srcset="img/musician-285w-min.jpg" media="(min-width: 992px) and (max-width: 1024px)">
                    <source srcset="img/musician-360w-min.jpg" media="(min-width: 1024px) and (max-width: 1200px)">
                    <source srcset="img/musician-840w-min.jpg 2x" media="(max-width: 600px)">
                    <img src="img/musician-min.jpg" alt="Un musicien" class="img-fluid intro-img-1">
                  </picture>