main {
    flex: 1;
}

.bandeau {
  overflow: hidden;
  background: #222;
  color: white;
  width: 100%;
  padding: 10px 0;
  position: relative;
  /* 👈 important👇 */
}

/* 👇 LA clé */
.track {
  display: flex;  
  width: max-content;
  animation: scroll 25s linear infinite;
  will-change: transform;
}

/* texte */
.track span {
  margin-right: 50px;
  font-size: 1.2rem;
  white-space: nowrap;
}

/* 👇 animation parfaite */
@keyframes scroll {
  from {
    transform: translateX(0);/* démarre juste à droite */
  }
  to {
    transform: translateX(-50%);
  }
}

.bandeau:hover .track {
  animation-play-state: paused;
}

/* Ajustement sur petits écrans */
@media (max-width: 600px) {
  .track {
    animation-duration: 15s;
  }
}