tried to add mobile & tablet styling but it didn't work

themes/default/static/css/main.css

@@ -22,9 +22,9 @@ header#banner{
 }
 	header#banner h1{
 		font-family: 'Syne';
-		font-size: 110px;
+		font-size: 7.5vw;
 		line-height:1.25;
-		margin: 1em 0;
+		margin: 0.7em 0;
 	}
 	header#banner h1 a{
 		text-decoration: none;
@@ -36,8 +36,8 @@ nav#menu{
 	margin:0 0 0 -11em;
 }
 	nav#menu li{
-		width: 145px;
-		height:10em;
+		width: 10vw;
+		height:10vw;
 		margin:1em 0;
 		padding:1em;
 		font-size: 75%;
@@ -53,14 +53,14 @@ nav#menu{
 		background-color: #95d1e6;
 	}
 	nav#menu li.pagelink{
-		height: 1.5em;
+		height: 2.5em;
 	}
 	nav#menu a{
 		text-decoration: none;
 	}
 
 section#content{
-	margin: 4em 0;
+	margin: 4em;
 }
 article{
 	margin: 3em 0 2em 0;
@@ -222,3 +222,38 @@ code{
 	font-size: smaller;
 	margin:4em 0;
 }
+
+p {
+	word-break: break-word;
+}
+
+
+/* Layout phone */
+@media (max-width:770px) {
+	nav#menu li {
+		width: 50vw;
+		height: 24vw;
+		font-size: 2em;
+		margin: 1em 0.1em;
+	}
+
+	header#banner h1 {
+		font-size: 10vw;
+	}
+
+	body{
+		margin-left: 9.4vw;
+	}
+
+}
+
+/* Layout tablet */
+@media (max-width:1024px) {
+	body {
+		margin-left: 13vw;
+	}
+
+		nav#menu li {
+			height: 14vw;
+		}
+}