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There are several options which allow you to further customise which CSS resources are used by the layout. These options are intended for "power users" who need extreme levels of control in their quest for perfection. If you don't understand these options, leave them ticked

Each option has a "Use Default..." option which will clear the layout-specific setting and use whatever setting is found in the parent layout.

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However, if you want ultimate control you can disable the Panel CSS resource. In this scenario, people can still use the Panel Editor and save their changes but their settings won't affect the layout.

TIP: You can turn off this option and then restrict CSS editing privileges to prevent people from customising the CSS in your layout.

Use inbuilt CSS for this layout

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However, sometimes the inbuilt CSS can get in the way of your own custom CSS if you're doing something really complex. If you want extreme control over the CSS that's used in your layout you can turn off the inbuilt CSS but be warned that you'll then have to manually create lots of custom CSS for all the various features in Confluence.

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• Panel Classes and IDs - if you need to specify CSS that affects a specific panel, this lists the classes you can use to make your CSS more specific.
• Style Sheets Overview - this shows how various CSS resources are included in the layout.
• 70 CSS tips and tricks - this external guide has loads of useful CSS tips and tricks but be warned that not all of them will work for in a dynamic application like Confluence.