I generally don't have a probably changing the value of the variables either in the settings.scss or in my custom.scss. For example I can easily change the font color using $body-font-color, and this in my custom.scss. However I am trying to change the background color of the titlebar using $titlebar-background with no luck, neither in settings.scss or custom.scss. In fact I can't use any of the variables in the docs under http://foundation.zurb.com/sites/docs/off-canvas.html. Does anyone know why this is happening?