.BTN_son {
    position: absolute;
    width: 100px;
    height: 100px;
    z-index: 1000;
    display: inline-block;
    cursor: pointer!important;
    /* background-color: black; */
}

[class*="BTN"], .open-image-link {
    cursor:auto;
}
.BTN_son .picto_son.play {
    background: url(../images/son-play.svg) no-repeat center;  
    background-size: 37px 45px;
}


.BTN_son .picto_son {
    position: absolute;
    left: calc(50% - 18px);
    top: calc(50% - 22px);
    width: 37px;
    height: 45px;
    background-size: 37px 45px;
    background: url(../images/son-pause.svg) no-repeat center;
   
}