Merge pull request #2794 from edx/marco/bug-fix/html-xmodule

bug fix for HTML xmodule styling which caused first line of text to be c...

cms/static/sass/views/_unit.scss

@@ -1396,8 +1396,10 @@ body.unit .xblock-type-container {
   }
 }
 
-// UI: special case discussion xmodule styling
+// UI: special case discussion, HTML xmodule styling
 
-body.unit .component .xmodule_DiscussionModule {
+body.unit .component {
+  .xmodule_DiscussionModule, .xmodule_HtmlModule {
     margin-top: ($baseline*1.5);
+  }
 }