Helix Ultimate and SP Page Builder visual interface provides controls for many CSS properties, but sometimes you may want to add additional, custom CSS that can't be created with option(s). You can easily customize the website with your own custom code, for example, with CSS, JavaScript, Meta tags, tracking and verification code by using the custom fields in that section of template settings. More information and tips how to customize design is inside Helix Ultimate Manual and blog post "Which line I have to edit...".