.home-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/histoire_horlogerie.jpg');
    background-size: cover;
    background-position: center;
    height: 550px;
}

.cadran-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/cadran.jpg');
    background-size: cover;
    background-position: center;
    height: 550px;
}

.arab-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/astrolab.jpg');
    background-size: cover;
    background-position: center;
    height: 550px;
}

.revolution-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/revolution.jpg');
    background-size: cover;
    background-position: center;
    height: 550px;
}

.introduction-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/temps.jpg');
    background-size: cover;
    background-position: center;
    height: 550px;
}
.age-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/montre_poche.jpg');
    background-size: cover;
    background-position: center;
    height: 550px;
}
.ere-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/quartz.jpg');
    background-size: cover;
    background-position: center;
    height: 550px;
}
.luxe-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/luxe.jpg');
    background-size: cover;
    background-position: center;
    height: 550px;
}
.musee-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/musee.jpg');
    background-size: cover;
    background-position: center;
    height: 550px;
}
.avenir-header {
    background: linear-gradient(rgba(0, 0, 0, 0.6), rgba(0, 0, 0, 0.6)), url('../img/avenir.jpg');
    background-size: cover;
    background-position: center;
    height: 550px;
}