.art-footer-body ul#menu-footer li { background-image: none; }
default styling footer menu in Artisteer footer block
oik.css was changed in oik version 1.7 to provide some default styling for menus in Artisteer generated themes.
If you create a menu called ‘footer’ and you include it in a ‘footer’ sidebar then it will be styled to display horizontally.
Note that the background image is still displayed by default. If you want to remove this then you can add the following line to your custom.css file.