.conteneur{
    max-width: 576px;
    margin: 50px auto;
    display: flex;
    justify-content: center;
}
.d2{
    width: 100%;
    height: 0px;
    padding-top: 100%;
    box-shadow: 0px 0px 10px #777;
    background-color: #EDEDED;
    background-size: contain;
    background-repeat: no-repeat;
    animation: fondu 30s ease-in-out infinite both;
}
.d1:hover, .d2:hover{
    animation-play-state: paused;
}
@keyframes fondu{
    

    0%{background-image: url("../images/galerie/avant murph.jpg");}
    25%{background-image: url("../images/galerie/compétition 7.2 CrossFit.jpg");}
    50%{background-image: url("../images/galerie/cours.jpg");}
    75%{background-image: url("../images/galerie/muscle up.jpg");}
    100%{background-image: url("../images/galerie/danse.jpg");}
}