#nav-boutons::-webkit-scrollbar {
    display: none;
}
#nav-boutons {
    -ms-overflow-style: none;
    scrollbar-width: none;
}
#nav-boutons a {
    flex-shrink: 0;
} 

.header-vendeur {
    background: rgba(255, 255, 255, 0.4); /* semi transparent */
    backdrop-filter: blur(10px);          /* 🔥 flou */
    -webkit-backdrop-filter: blur(10px);                    
}