Go to Appearance -> Customize -> Miscellaneous

1. Background Image: Add/Change footer background image of whole site
2. Custom CSS: Put your Custom CSS here
3. Basic Site Settings:
   Font-family : Changes font family of the all text
   Color : Changes text color
   Link color: Changes link color
   Link Hover Color: Changes link color on hover
   Background Color: Changes background color of the site
   Note – Font-family, Color, Link color, Link hover color, Background color settings apply throughout the site.