Setting standard anchor links hover color

Hi there, I have a simple query. I'm trying to change the standard anchor links to adjust their hover colour from green to orange (such as links that appear in the widget sidebar). I couldn't see anywhere to set this in the Color Settings, so have tried to add this as custom css but it is not working: .widget-area a:hover { color: #f37137; } Please can you help advise. Thanks, James