Fix header nav style on Markdown preview tool

pages/markdown.tmpl

@@ -1,8 +1,5 @@
 {{define "head"}}<title>Markdown Preview</title>
 <style type="text/css">
-	h1#markdown {
-		margin: 1em 0;
-	}
 	textarea {
 		margin: 2em 0 1em;
 		min-height: 10em;

static/css/dev.css

@@ -2,3 +2,15 @@ nav#full-nav .tabs a {
 	font-size: 1em;
 	color: #777 !important;
 }
+
+body#post header {
+	padding: 0;
+	-moz-opacity: 1;
+	-khtml-opacity: 1;
+	-webkit-opacity: 1;
+	opacity: 1;
+}
+
+body#post header img {
+	max-width: initial;
+}