Fixed Sidebar

Hi Guys,

I would like to have the sidebar of this website to be fixed, that it shows full page and when I scroll it stays where it is.

I am not a coder but googling around I found that by inputting into the stylesheet:

.sidebar {
    position: fixed; height:100%;
}

…I can have a very similar result to what I want BUT links that are present in the sidebar don’t work any longer if I do this edit.

Any help please?