Another team member set up the following for the "cover page" of the help file. As it is set as a background image, it does not resize when changing the size of the window. Can I simply change it to an image with percentage values?
There's a background-size property, which I've never used.
I'd probably start with:
But there are a bunch of other settings, if that doesn't work. It looks like you can also set a width and height value like "background-size: 100% 50px;" which I think would stretch the image width to fit the width of the window while limiting the height to 50px (you'll get a distorted image if you don't match the original image aspect ratio).