Hi, thank you for using Boss Cart JV.

Let me answer for your question with a little quote from the almost ready manual.

You may edit the default template selecting the template manager at the admin graphical control panel or using your own software.
The template uses three files concerning the design. The core file is the
/templates/revolution/index.php, the path of the style sheet is the /templates/revolution/css/template_css.css. The fancy mouse over effects are controlled by the /templates/js/hover.js. With some webmastering experience it will be easy to modify the colors or the layout of the template.
If you want a custom template, feel free to contact us.

If you need further information, please let me know
Thanks!