The parameters which relate to design (like colors) are placed in :file:`themes/themename/layout.inc.phpscss/_variables.scss`. You might also want to create :file:`config.footer.inc.php` and :file:`config.header.inc.php` files to add your site specific code to be included on start and end of each page.
layout.inc.phpscss/_variables.scss`. You might also want to create :file:`config.footer.inc.php` and :file:`config.header.inc.php` files to add your site specific code to be included on start and end of each page.