#header {
  height: 204px;
  position: relative;
  z-index: 99;
/*  background: #f6f5f5; color gris tres clair
*/ 
background: url(images/header-bg-accueil.jpg) center no-repeat;
background-color: #ecebeb;

 /*background: #fff;*/
  border-bottom: 1px solid #fff;
}