Chart rectangle width for responsiveness

Hi! I’ve got a responsive design website.
I found everything really cool, except one thing: the width of white rectangle, under map, with altitude, speed, etc. is not expressed in percentage but in px.
That means that is not able to refresh its size if user resizes his browser window.

This is bad for desktop computers (for manual resize) and for smartphone and tablet devices, if user rotates his device from landscape to portrait (or opposite).

Thanks a lot and congrats for this plugin! Good job! 😉

http://wordpress.org/plugins/wp-gpx-maps/