html, body {
	margin:0;
	padding:0;
        min-height: 300px;
        background-attachment: fixed;
        background-image: url("../img/fond_nat.jpg");
}
 a:visited,a:link{
    text-decoration: none;
    color: #000000;
}
.alert{
	color:red;
}
.alertverte{
	color:green;
}