.headers {
    max-height: 1200px;
    height: 100vh;
}

.header-site  {
    background-image:url(../img/header-bg.jpg);
}

.header-prestations  {
    background-image:url(../img/header-prestations.jpg);
}

.header-projets  {
    background-image:url(../img/header-projets.jpg);
}

.header-fabrique  {
    background-image:url(../img/header-fabrique.jpg);
}

.header-qui-sommes-nous  {
    background-image:url(../img/header-qui-sommes-nous.jpg);
}