Added margin to audio in SW theme

boards/static/css/sw/base_page.css

@@ -411,4 +411,8 b' li {'
 .image-metadata {
     font-style: italic;
     font-size: 0.9em;
-}
  No newline at end of file
+}
+
+audio {
+    margin-top: 1em;
+}