WHMCS themes are composed of several template files, CSS, and JavaScript. Familiarize yourself with the structure of these files and how WHMCS uses them to render pages.
Start with a base theme that is already responsive, such as the default "Six" theme provided by WHMCS. This can serve as a foundation for your customizations.
Bootstrap provides a grid system, pre-designed components, and utilities that make it easier to create a responsive design.
To keep your customizations separate from the base theme, create a child theme. This ensures that your changes are preserved even if the base theme is updated.
Ensure that any JavaScript you use is also responsive. Avoid fixed dimensions and use percentages or flexible layouts.
Provide documentation for your theme, including installation and customization instructions. Offer support channels for users to ask questions and report issues.
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