body		{
		min-height: 100%;
		background-image: url("../images/moulin.jpg");
		font-family: 'Trebuchet MS', Arial, sans-serif;
		background-repeat: no-repeat;
		background-attachment: fixed;
		background-position: center ;
		color: #181818;
			}
.background_opacity  {
			position: fixed;
			z-index: -10;
			top: 0; left: 0; right: 0; bottom: 0;
			background-color: rgba( 255, 255, 255, 0.5);
			filter: (opacity=50);
						}