I'm having trouble with a Bootstrap dropdown menu extending beyond the height of the device when viewed in landscape mode on an iPhone (or any device with a small screen). The scrollbar displays but it too extends too far off the screen and is of no use in scrolling. 

Example is at: <http://dev.backcountryaccess.com/>

Please let me know if I should be posting this as a jsFiddle as well, but thought it was easiest to just post the link...

Would prefer a CSS fix but anything that works would be extremely helpful!