/************************ menu classique *************************/
#navpos {
	position:fixed;
}
.nav-btns { width:1200px; }
.nav { }
.nav li  {
	display:inline;
	width:150px;
	text-align:center;
}
.main { 
	margin:auto;
}

/************************************* CSS Tablette et netbook */
@media only screen and (min-width:270px) and (max-width:479px) { 

}
@media only screen and (min-width:480px) and (max-width:640px) { 

}