Show info about github flavored md under comment box

app/assets/stylesheets/comments.css.scss

@@ -3,10 +3,24 @@
 }
 
 #new-comment {
+  width: 800px;
+
   textarea {
-    width: 960px;
+    width: 100%;
     height: 80px;
   }
+
+  .github-flavor {
+    text-align: right;
+  }
+
+  .body {
+    margin-bottom: 0;
+
+    textarea {
+      margin-bottom: 0;
+    }
+  }
 }
 
 li.comment {

app/views/asciicasts/show.html.erb

@@ -53,9 +53,16 @@
   <% if current_user %>
     <form id="new-comment">
       <label>Your comment</label>
-      <p>
+
+      <p class="body">
         <textarea type="text" name="body" id="comment-body"></textarea>
       </p>
+
+      <p class="github-flavor">
+        Parsed with <a href="http://github.github.com/github-flavored-markdown/"
+                       target="_blank">GitHub Flavored Markdown</a>
+      </p>
+
       <button type="submit" class="btn">Post</button>
     </form>
   <% else %>