.logoo,
.activateurdemenu { transition: filter 0.3s ease, background-color 0.3s ease;
}
header {
transition: background-color 0.3s ease; 
}
header .menu-ouvert {
background-color: #fff; }
.header { transition: background-color 0.3s ease;
}
.header { backdrop-filter: blur(2px); 
-webkit-backdrop-filter: blur(2px); transition: background-color 0.3s ease, backdrop-filter 0.3s ease;
}
.logoo{
filter: brightness(0) invert(1);
}