#mb_boite_video {
    position: fixed;
    width: 100%;
    height: 100vh;
    z-index: 99990;
	top: 0;
}
#mb_boite_video > div {
    width: 95%;
    margin-left: auto;
    margin-right: auto;
    max-height: 80%;
    text-align: center;
}
#mb_boite_video > div > div {
    margin-left: auto;
    margin-right: auto;
}
#mb_boite_video iframe {
    z-index: 99991;
}
#fermer_boite {
    position: fixed;
    top: 30px;
    font-size: 2em;
    color: #fff;
    z-index: 99992;
    right: 15px;
    cursor: pointer;
	background: rgba(0,0,0,0.4);
	border-radius: 50px;
	transition: all 0.5s ease-out;
}
#fermer_boite:hover {
    background: black;
    font-size: 3em;
	transition: all 0.15s ease-out;
}
.element_caché {
  display: none;
}