started fixed header, fixed anchor links with fixed header

sites/all/themes/figureslibres/clameurs/css/styles.scss

@@ -49,15 +49,30 @@ body{
 
 }
 
+@mixin main_centred(){
+	width:1024px; margin:0 auto;
+}
+
 #container{
 	width:1024px; margin:0 auto;
 	// overflow-x: visible;
 }
+$header_height:400px;
 
 #header{
+	position: fixed;
+	width:100%; max-height: $header_height;
+	z-index: 20;
+	background-color: transparentize(#fff, 0.1);
+	hgroup.logo{
+		@include main_centred();
+		padding: 1em 0;
+	}
+	h1{margin:0;}
 	h1 a{
 		display:block;
 		height:335px;
+		// transition: height 0.1s ease-in-out;
 		background-image: url(../../images/logo.png);
 		background-size: contain;
 		background-position: center;
@@ -72,6 +87,13 @@ body{
 	}
 }
 
+#main{
+	padding-top: $header_height;
+	>.region{
+		@include main_centred();
+	}
+}
+
 // about
 #node-63{
 	// color:$bleu;
@@ -268,6 +290,11 @@ body,
 		font-size: 3em;
 		font-weight: 400;
 		padding-left: 0.18em;
+		position:relative;
+		span{
+			position: absolute;
+			top:-177px;
+		}
 	}
 
 	.content{