How to Edit CSS in Joomla
- George Apostolov
How to Edit CSS in Joomla: step-by-step guide
Access the core configuration area through the 'System' menu to manage your site settings.
Explore 'Site Templates' where you can customize the visual appearance of your Joomla website.
Open 'Cassiopeia', Joomla's modern and responsive default template, to customize its appearance.
Access the 'CSS' directory where style files control your template's visual presentation.
Open 'editor.css ' which controls the styling of content editing interfaces.
Examine the h1 heading style definition to customize your site's typography.
Click 'Save & Close' to preserve your template customizations to instantly update your site's appearance.
Quick answer: To edit CSS in Joomla, access the System menu, navigate to Site Templates, and open the Cassiopeia template. Next, open the CSS directory and select editor.css to examine the h1 heading style definition. Finally, click Save and Close to preserve your template customizations.
About this Joomla tutorial
Customize your Joomla website styling by editing the Cassiopeia template CSS files and saving your typography changes. This guide shows how to edit CSS in Joomla in 7 steps, starting with "Access the core configuration area through the 'System' menu to manage your site settings" and finishing with "Click 'Save & Close' to preserve your template customizations to instantly update your...". The interactive demo above is a click-through copy of the real Joomla interface, so you can rehearse each step before doing it in your own account.
Frequently asked questions
How many steps does it take to edit CSS in Joomla?
7 steps. Each one is listed in order above, and the demo highlights exactly where to click.
Can I try it without changing my own account?
Yes. Clicking through the demo doesn't touch your Joomla data or settings. Once you know the flow, repeat it in your own workspace.
This tutorial is filed under Joomla. Related guides: How to Edit Footer in Joomla, How to Edit Header in Joomla and How to Edit Joomla Template. Last reviewed 05 Oct 2026.
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