.md-header {
    height: 5.5rem;
    background-image: -moz-linear-gradient(to right, rgba(0,0,0,0.1), rgba(0,0,0,1.0)), url("../../../images/banniere.png");
    background-image: -webkit-linear-gradient(to right, rgba(0,0,0,0.1), rgba(0,0,0,1.0)), url("../../../images/banniere.png");
    background-image: -ms-linear-gradient(to right, rgba(0,0,0,0.1), rgba(0,0,0,1.0)), url("../../../images/banniere.png");
    background-image: linear-gradient(to right, rgba(0,0,0,0.1), rgba(0,0,0,1.0)), url("../../../images/banniere.png");
}

.md-header__button.md-logo img {
    height: 4.2rem;    
}