I'm developing a site that uses a fixed menu. Some of my plugins require that this fixed menu has a very high z-index, so that it remains on top of all the various components and content. This causes it to display above the modal that pops up for editing page content, hiding some of the options. I figure I can probably fix this by adding a z-index to the modal itself, but I haven't the foggiest clue where to find the CSS for it. Any idea where I should look for it? Any help is much appreciated!