Familiarize yourself with the structure of WHMCS templates. WHMCS utilizing smartly templating engine, whcih separates HTML from PHP logic. Templates are locate in the "templates" directory within your WHMCS installation.
Before making any edits or changes its vital to backup your WHMCS files, specially the templates files you will be modifying. This make sure that your can return to the original state.
WHMCS offers a several built-in templates, but you can also purchase or download custom templates from third-party sources.
Personalize the CSS styles to match your desired design and branding. You can easily modify fonts, color, spacing, and other visual elements to personalize a cohesive and professional appearance.
Customize and modify template files (.tpl files) to personalize the layout and structure of your WHMCS pages.
Include your business's branding elements like colors, logo, and typography into the WHMCS templates.