Customizing an existing theme
To customize an existing theme, it is recommended to make a copy of the entire theme folder, and rename it. Following renaming the folder, edit the following files to amend the theme paths and name:
theme.css - rename to match your theme name config.php - amend theme name
base.html.php - amend file path for CSS import to use new folder and CSS filename; amend the default page title from 'Mautic'
Mautic themes are written in HTML and PHP, to make amends to the structure or layout simply edit the files in the new theme and upload them to your instance. Ensure that your hosting provider does not have caching enabled, as this can sometimes prevent changes to CSS files being replicated instantly.