How do I…. change the colour of the background of the dropdown on the menu.

Hi,

How do I…. change the colour of the background of the dropdown on the menu on the BP Corporate theme.

The dropdown is currently black with white text, I would like to change it to a specific blue.

Is there something I can add to my ‘Custom CSS plugin’ or add to the style sheet of a child theme.

Many thanks and warmest regards

Andrew