Just been trying out the WP GPX maps plugin.
I appreciate the simplicity with which it does its job. However, I notice that if I add a waypoint, the plugin displays a popup and it looks like the background style (particularly colour) is generated inline.
My site style is white text on black background, and the foreground colour is white – so I end up with white on white.

Is there any method of specifying a different foreground colour in the popup?

I’ve done a kludgy fix in wp-gpx-maps/WP-GPX-Maps.js to wrap the content in a <div> element (with a style attribute), although it would be better to give it a css class.