Im not great with php and didn't develop this website. However I've ended up doing some small changes to it.
I'm trying to add a grey sidebar underneath the product navigation to the left. I know i need to add a div to the page template, however when I do this it makes the page not appear, just a white page when you try and load it.
Here is the page template code.
and here is a link to the page im trying to edit.