okay là normalement c'est bon

assets/css/template.css

@@ -42,19 +42,13 @@ body {
 }
 
 .bg{
-	background-attachment: fixed,fixed;
-	-webkit-background-attachment: fixed,fixed;
-
 	background-color: #499135;
 	background-repeat: no-repeat, no-repeat;
 	background-size: auto,cover;
-	-webkit-background-size: auto,cover;
-	-moz-background-size: auto,cover;
-	-o-background-size: auto,cover;
 
 	position: fixed;
-	height: 100vh;
-	width: 100vh;
+	height: 100%;
+	width: 100%;
 
 	/* s/o coconut.jpeg */
 	z-index: -10000000;
@@ -69,9 +63,8 @@ body {
 	.bg{
 		background-position: center center, center center;    
 		background-size: auto,cover;
-		background-attachment: scroll,scroll;
-		-webkit-background-attachment: scroll,scroll ;
-
+		height: 100vh;
+		width: 100vh;
 	}
 }