I'm trying to debug a drop-down menu. I don't have access to the website just yet so I'm trying to find a solution through Google Chrome Developer Tools which I can test and then apply to the site when I get access. It's only CSS and perhaps some Javascript changes.

The problem is I want to apply some new CSS style rules through dev tools, but then have these persist upon refreshing the web page. Is there a way I can apply styles and get them to persist? I've looked at the resources section, which kind of suggests I can do something like this (maybe by adding a local style sheet as a resource?), but I just can't figure out how to do it.

Could anyone point me in the right direction here?

Many thanks folks...