Posted on: July 14, 2015, 02:42:25 AM
Generally you should just be able to add a position:fixed call to the menu layer. The way you have it setup wouldn't work though as the header and menu are separate elements so the menu would float further down the page and not be locked at the top.
The type of change would require some custom programming changes in the index.php to combine both the menu and header block into a single <div>. Then you could specify a fixed position on that div so when you scroll down it will always be locked at the top.