.jumbotron {
    background: rgba(0, 0, 0, 0) url(/www/inscription_en_ligne_2.0/personnalisation/images/35545-transbaie.jpg) no-repeat top center fixed;
      background-size: cover;
  
  	/*background-image: none;
    background-color: #175564;
    background: linear-gradient(#175564, white);*/
}