For my items pages, the list of metadata is quite long and I've set an absolute size for the div that holds my metadata, and I added a scrollbar in the style.css file (overflow:auto). I'd like to customize the appearance of my scrollbar. The methods I've found involve CSS, a javascript file, and some coding at the top of the html page.
Where would I put each of these items? My items page is show.php, so where should the coding go that is normally at the top of an html page?
Where should I put the scrollbar.js file, in which folder?
I assume I would just add the CSS for the scrollbar to the style sheet in my theme, is that right?