Add static scrollbar to top of pages (supports display and nav for large tables)

Thanks Charpentier Lucas!

I've added the following code to our Advanced CSS in our theme, so the bottom scrollbar appears for all tables in our wiki, regardless of whether the sorteable tables macro is used. 
 

table {    
display: block;    
overflow-x: auto;    
width: 100%; 
}

It looks more complicated to add a top scrollbar, but I'll keep investigating. 

Moving forward, could this be added by default to the Advanced CSS? It would improve the table viewing experience considerably. 

Thanks again