Fix markdown header formatting in motd

www/css/style.css

@@ -238,13 +238,21 @@ main {
 	background-color: #fff;
 }
 
-main h2 {
+main h1,
+main h2,
+main h3,
+main h4,
+main h5,
+main h6 {
 	color: #002244;
-
 	z-index: 2; /* Make appear under #menu */
 	position: relative;
 }
 
+main h1 {
+	font-size: 1.8em;
+}
+
 article {
 	overflow-y: hidden;
 }