How to change color of Top menu bar from black to white

How to change color of Top menu Header bar from black to white and color of menu item text to black.
Also how to change the font type for Numbers in Sydney theme. Thanks.

Go to your Dashboard.
Scroll down to Appearance then select customize.
In the customize screen scroll down to colors menu.
Then Select Header
Menu background can be changed to white.
Site description, Top level menu items, Sub-menu items should be Black or any other color than white.
To save changes click Publish
Font size can be changed in the customize screen by going to fonts.
Hope this helps