Hi Delphine -

In the Aware theme, you can edit the color and size of your nav bar in the file titled tablet-and-desktop.scss. In the default stylesheet, this starts at line 159.

Keep in mind, however, that any changes made in tablet-and-desktop.scss won't affect the mobile version of your nav bar. If you want to make style changes to that, you'll need to go into _mobile-nav.scss. That file is found in theme - current custom theme - files. 

To change the location of the nav bar, you'll want to go into layout.html.

Thanks for your question!