Improve margins above and below H1s. Make slightly larger too.

common/static/styles/common.css

@@ -249,17 +249,17 @@ h1, h2, h3, h4 {
 	
 	@media only screen and (min-width: 33.4em)
 	{
-		h1, h2, h3, h4
+		h2, h3, h4
 		{
 			margin: 2em 0 1em;
 		}
 	}
 
 h1 {
-	font-size: 2em;
+	font-size: 2.5em;
 	font-weight: bold;
 	/* ↓ as h1s are always at the top of the page */
-	margin-top: 1em;
+	margin: 0.5em 0;
 	text-align: center;
 }