If you have enabled the Footer Bottom Bar from Appearance Customize Layout Footer, then you can see the following options available to set colors for the footer bar in Appearance Customize Colors & Background Footer Bar.

1. Footer Bottom Bar Background Color: This will set a background for footer bar container.
2. Footer Bar Top Border Size: You can set footer bar top border size here.
3. Footer Bar Top Border Color: This color is applied to the footer bar top border.
4. Footer Bar Bottom Border Size: You can set footer bar bottom border size here.
5. Footer Bar Bottom Border Color: This color is applied to the footer bar bottom border.
6. Footer Bar Widgets Title Color: This color is applied to the widgets title in footer bar.
7. Footer Bar Widgets Text Color: This will apply to footer bar text.
8. Footer Bar Widgets Link Color: This will set a link color in footer bar widgets.
9. Footer Bar Widgets Link Hover Color: This will apply a link hover color in footer bar.